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259 lines
129 KiB
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259 lines
129 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
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<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="C21D" definition-exists="true" date-revised="2021-01-01" status="published"><classification-symbol>C21D</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS</text></title-part><title-part><text>GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS</text></title-part><title-part><text>MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING </text><reference><text>surface treatment of metallic material involving at least one process provided for in class <class-ref scheme="cpc">C23</class-ref> and at least one process covered by this subclass <class-ref scheme="cpc">C23F17/00</class-ref>; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials <class-ref scheme="cpc">C30B</class-ref></text></reference></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph>In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.</note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="C21D1/00" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/00</classification-symbol>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21D1/00" definition-exists="true" ipc-concordant="C21D1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D1/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/02" definition-exists="false" ipc-concordant="C21D1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/04" definition-exists="false" ipc-concordant="C21D1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with simultaneous application of supersonic waves, magnetic or electric fields</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/06" definition-exists="false" ipc-concordant="C21D1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Surface hardening</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/08" definition-exists="false" ipc-concordant="C21D1/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with flames</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/09" definition-exists="false" ipc-concordant="C21D1/09" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/09</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by direct application of electrical or wave energy</text></title-part><title-part><text>by particle radiation</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D1/10" definition-exists="false" ipc-concordant="C21D1/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by electric induction</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/18" definition-exists="false" ipc-concordant="C21D1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hardening </text><reference><text><class-ref scheme="cpc">C21D1/02</class-ref> takes precedence</text></reference></title-part><title-part><text>Quenching with or without subsequent tempering </text><reference><text>quenching devices <class-ref scheme="cpc">C21D1/62</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/185" definition-exists="false" ipc-concordant="C21D1/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/185</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>from an intercritical temperature</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/19" definition-exists="false" ipc-concordant="C21D1/19" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/19</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by interrupted quenching</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D1/20" definition-exists="false" ipc-concordant="C21D1/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Isothermal quenching, e.g. bainitic hardening</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D1/22" definition-exists="false" ipc-concordant="C21D1/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Martempering</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/25" definition-exists="false" ipc-concordant="C21D1/25" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/25</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/26" definition-exists="false" ipc-concordant="C21D1/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Methods of annealing</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/28" definition-exists="false" ipc-concordant="C21D1/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Normalising</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/30" definition-exists="false" ipc-concordant="C21D1/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Stress-relieving</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/32" definition-exists="false" ipc-concordant="C21D1/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Soft annealing, e.g. spheroidising</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/34" definition-exists="false" ipc-concordant="C21D1/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Methods of heating </text><reference><text><class-ref scheme="cpc">C21D1/06</class-ref> takes precedence</text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/38" definition-exists="false" ipc-concordant="C21D1/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Heating by cathodic discharges</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/40" definition-exists="false" ipc-concordant="C21D1/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Direct resistance heating</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/42" definition-exists="false" ipc-concordant="C21D1/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/42</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Induction heating</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/44" definition-exists="false" ipc-concordant="C21D1/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/44</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in heat-treatment baths</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D1/46" definition-exists="false" ipc-concordant="C21D1/46" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/46</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Salt baths</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D1/48" definition-exists="false" ipc-concordant="C21D1/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/48</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Metal baths</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D1/50" definition-exists="false" ipc-concordant="C21D1/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Oil baths</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/52" definition-exists="false" ipc-concordant="C21D1/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/52</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with flames</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/53" definition-exists="false" ipc-concordant="C21D1/53" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/53</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Heating in fluidised beds</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/54" definition-exists="false" ipc-concordant="C21D1/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/54</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Determining when the hardening temperature has been reached by measurement of magnetic or electrical properties</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/55" definition-exists="false" ipc-concordant="C21D1/55" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D1/55</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Hardenability tests, e.g. end-quench tests</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/56" definition-exists="false" ipc-concordant="C21D1/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/56</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>characterised by the quenching agents</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/58" definition-exists="false" ipc-concordant="C21D1/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/58</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Oils</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/60" definition-exists="false" ipc-concordant="C21D1/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/60</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Aqueous agents</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/607" definition-exists="false" ipc-concordant="C21D1/607" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/607</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Molten salts</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/613" definition-exists="false" ipc-concordant="C21D1/613" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/613</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gases</text></title-part><title-part><text>Liquefied or solidified normally gaseous material</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/62" definition-exists="false" ipc-concordant="C21D1/62" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/62</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Quenching devices</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/63" definition-exists="false" ipc-concordant="C21D1/63" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/63</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for bath quenching</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D1/64" definition-exists="false" ipc-concordant="C21D1/64" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D1/64</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>with circulating liquids</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/667" definition-exists="false" ipc-concordant="C21D1/667" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/667</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for spray quenching</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/673" definition-exists="false" ipc-concordant="C21D1/673" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/673</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for die quenching</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/68" definition-exists="false" ipc-concordant="C21D1/68" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/68</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Temporary coatings or embedding materials applied before or during heat treatment</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/70" definition-exists="false" ipc-concordant="C21D1/70" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/70</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>while heating or quenching</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/72" definition-exists="false" ipc-concordant="C21D1/72" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/72</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>during chemical change of surfaces</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/74" definition-exists="false" ipc-concordant="C21D1/74" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D1/74</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/76" definition-exists="false" ipc-concordant="C21D1/76" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/76</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Adjusting the composition of the atmosphere</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D1/763" definition-exists="false" ipc-concordant="C21D1/76" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/763</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a catalyst</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/767" definition-exists="false" ipc-concordant="C21D1/767" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/767</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with forced gas circulation</text></title-part><title-part><text>Reheating thereof</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/773" definition-exists="false" ipc-concordant="C21D1/773" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/773</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>under reduced pressure or vacuum</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/78" definition-exists="false" ipc-concordant="C21D1/78" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/78</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Combined heat-treatments not provided for above</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D1/785" definition-exists="false" ipc-concordant="C21D1/78" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/785</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Thermocycling</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/82" definition-exists="false" ipc-concordant="C21D1/82" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D1/82</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Descaling by thermal stresses </text><reference><text>mechanically <class-ref scheme="cpc">B21</class-ref>, <class-ref scheme="cpc">B23</class-ref>; chemically <class-ref scheme="cpc">C23</class-ref>; electrolytically <class-ref scheme="cpc">C25F1/00</class-ref></text></reference></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D1/84" definition-exists="false" ipc-concordant="C21D1/84" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D1/84</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Controlled slow cooling </text><reference><text>cooling-beds for metal rolling <class-ref scheme="cpc">B21B43/00</class-ref></text></reference></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21D3/00" definition-exists="true" ipc-concordant="C21D3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D3/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Diffusion processes for extraction of non-metals</text></title-part><title-part><text>Furnaces therefor </text><reference><text>local protective coatings <class-ref scheme="cpc">C21D1/72</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D3/02" definition-exists="false" ipc-concordant="C21D3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D3/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Extraction of non-metals</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D3/04" definition-exists="false" ipc-concordant="C21D3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D3/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Decarburising</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D3/06" definition-exists="false" ipc-concordant="C21D3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D3/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Extraction of hydrogen</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D3/08" definition-exists="false" ipc-concordant="C21D3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D3/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Extraction of nitrogen</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D3/10" definition-exists="false" ipc-concordant="C21D3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D3/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Furnaces therefor</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21D5/00" definition-exists="true" ipc-concordant="C21D5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D5/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Heat treatments of cast-iron</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D5/02" definition-exists="false" ipc-concordant="C21D5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>improving the malleability of grey cast-iron</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D5/04" definition-exists="false" ipc-concordant="C21D5/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D5/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of white cast-iron</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D5/06" definition-exists="false" ipc-concordant="C21D5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D5/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Malleabilising</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D5/08" definition-exists="false" ipc-concordant="C21D5/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D5/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with oxidation of carbon</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D5/10" definition-exists="false" ipc-concordant="C21D5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D5/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in gaseous agents</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D5/12" definition-exists="false" ipc-concordant="C21D5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D5/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in solid agents</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D5/14" definition-exists="false" ipc-concordant="C21D5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D5/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Graphitising</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D5/16" definition-exists="false" ipc-concordant="C21D5/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D5/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Packing agents</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21D6/00" definition-exists="true" ipc-concordant="C21D6/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D6/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Heat treatment of ferrous alloys</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D6/001" definition-exists="false" ipc-concordant="C21D6/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D6/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing Ni </text><reference><text><class-ref scheme="cpc">C21D6/004</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D6/002" definition-exists="false" ipc-concordant="C21D6/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D6/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing Cr </text><reference><text><class-ref scheme="cpc">C21D6/004</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D6/004" definition-exists="false" ipc-concordant="C21D6/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D6/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing Cr and Ni</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D6/005" definition-exists="false" ipc-concordant="C21D6/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D6/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing Mn</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D6/007" definition-exists="false" ipc-concordant="C21D6/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D6/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing Co</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D6/008" definition-exists="false" ipc-concordant="C21D6/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D6/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing Si</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D6/02" definition-exists="false" ipc-concordant="C21D6/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D6/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hardening by precipitation</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D6/04" definition-exists="false" ipc-concordant="C21D6/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D6/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hardening by cooling below 0 degrees Celsius</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21D7/00" definition-exists="true" ipc-concordant="C21D7/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D7/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifying the physical properties of iron or steel by deformation </text><reference><text>apparatus for mechanical working of metal <class-ref scheme="cpc">B21</class-ref>, <class-ref scheme="cpc">B23</class-ref>, <class-ref scheme="cpc">B24</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D7/02" definition-exists="false" ipc-concordant="C21D7/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D7/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by cold working</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D7/04" definition-exists="false" ipc-concordant="C21D7/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D7/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of the surface</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D7/06" definition-exists="false" ipc-concordant="C21D7/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D7/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by shot-peening or the like</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D7/08" definition-exists="false" ipc-concordant="C21D7/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D7/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by burnishing or the like</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D7/10" definition-exists="false" ipc-concordant="C21D7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D7/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of the whole cross-section, e.g. of concrete reinforcing bars</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D7/105" definition-exists="false" ipc-concordant="C21D7/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D7/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of concrete reinforcing bars</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D7/12" definition-exists="false" ipc-concordant="C21D7/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D7/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by expanding tubular bodies</text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D7/13" definition-exists="false" ipc-concordant="C21D7/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D7/13</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by hot working</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21D8/00" definition-exists="true" ipc-concordant="C21D8/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifying the physical properties by deformation combined with, or followed by, heat treatment </text><reference><text>hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation <class-ref scheme="cpc">C21D1/02</class-ref></text></reference></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D8/005" definition-exists="true" ipc-concordant="C21D8/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>C21D8/005</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>of ferrous alloys </text><reference><text><class-ref scheme="cpc">C21D8/02</class-ref> - <class-ref scheme="cpc">C21D8/12</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D8/02" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-07-01" status="published"><classification-symbol>C21D8/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>during manufacturing of plates or strips </text><reference><text><class-ref scheme="cpc">C21D8/12</class-ref> takes precedence</text></reference></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> In this group classification is made according to the most important feature in one subgroup only; for other features indexing codes of <class-ref scheme="cpc">C21D</class-ref> are added </note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/0205" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of ferrous alloys</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/021" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a particular fabrication or treatment of ingot or slab</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0215" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0215</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Rapid solidification; Thin strip casting</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/0221" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0221</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the working steps</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0226" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0226</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hot rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0231" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0231</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Warm rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0236" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0236</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cold rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0242" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0242</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Flattening; Dressing; Flexing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/0247" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0247</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the heat treatment</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0252" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0252</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with application of tension</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0257" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0257</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with diffusion of elements, e.g. decarburising, nitriding</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0263" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0263</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>following hot rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0268" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0268</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>between cold rolling steps</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0273" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0273</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Final recrystallisation annealing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/0278" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0278</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a particular surface treatment </text><reference><text><class-ref scheme="cpc">C21D8/0294</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0284" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0284</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Application of a separating or insulating coating</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0289" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0289</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Application of a tension-inducing coating</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/0294" definition-exists="false" ipc-concordant="C21D8/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0294</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a localised treatment</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/04" definition-exists="true" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-07-01" status="published"><classification-symbol>C21D8/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>to produce plates or strips for deep-drawing</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> In this group classification is made according to the most important feature in one subgroup only; for other features indexing codes of <class-ref scheme="cpc">C21D</class-ref> are added </note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0405" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0405</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of ferrous alloys</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/041" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/041</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a particular fabrication or treatment of ingot or slab</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0415" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0415</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Rapid solidification; Thin strip casting</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0421" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0421</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the working steps</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0426" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0426</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hot rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0431" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0431</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Warm rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0436" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0436</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cold rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0442" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0442</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Flattening; Dressing; Flexing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0447" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0447</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the heat treatment</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0452" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0452</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with application of tension</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0457" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0457</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with diffusion of elements, e.g. decarburising, nitriding</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0463" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0463</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>following hot rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0468" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0468</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>between cold rolling steps</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0473" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0473</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Final recrystallisation annealing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0478" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0478</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a particular surface treatment </text><reference><text><class-ref scheme="cpc">C21D8/0494</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0484" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0484</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Application of a separating or insulating coating</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D8/0489" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0489</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Application of a tension-inducing coating</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/0494" definition-exists="false" ipc-concordant="C21D8/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/0494</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a localised treatment</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D8/06" definition-exists="true" ipc-concordant="C21D8/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>during manufacturing of rods or wires</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/065" definition-exists="false" ipc-concordant="C21D8/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of ferrous alloys</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/08" definition-exists="false" ipc-concordant="C21D8/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for concrete reinforcement</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D8/10" definition-exists="true" ipc-concordant="C21D8/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>during manufacturing of tubular bodies</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/105" definition-exists="false" ipc-concordant="C21D8/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/105</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of ferrous alloys</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D8/12" definition-exists="true" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-07-01" status="published"><classification-symbol>C21D8/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>during manufacturing of articles with special electromagnetic properties</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> In this group classification is made according to the most important feature in one subgroup only; for other features indexing codes of <class-ref scheme="cpc">C21D</class-ref> are added </note-paragraph></note></notes-and-warnings>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/1205" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a particular fabrication or treatment of ingot or slab</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1211" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1211</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Rapid solidification; Thin strip casting</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/1216" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1216</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the working step(s) being of interest</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1222" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1222</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hot rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1227" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1227</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Warm rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1233" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1233</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cold rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1238" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1238</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Flattening; Dressing; Flexing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/1244" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1244</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the heat treatment(s) being of interest</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/125" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/125</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with application of tension</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1255" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1255</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with diffusion of elements, e.g. decarburising, nitriding</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1261" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1261</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>following hot rolling</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1266" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1266</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>between cold rolling steps</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1272" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1272</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Final recrystallisation annealing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/1277" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1277</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a particular surface treatment </text><reference><text><class-ref scheme="cpc">C21D8/1294</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1283" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1283</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Application of a separating or insulating coating</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D8/1288" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1288</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Application of a tension-inducing coating</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D8/1294" definition-exists="false" ipc-concordant="C21D8/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D8/1294</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>involving a localized treatment</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21D9/00" definition-exists="true" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D9/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles</text></title-part><title-part><text>Furnaces therefor</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0006" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details, accessories not peculiar to any of the following furnaces </text><reference><text>control devices <class-ref scheme="cpc">C21D11/00</class-ref></text></reference></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/0012" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0012</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Rolls; Roll arrangements</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/0018" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0018</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for charging, discharging or manipulation of charge</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/0025" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Supports; Baskets; Containers; Covers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0031" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0031</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Rotary furnaces with horizontal or slightly inclined axis</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0037" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0037</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Rotary furnaces with vertical axis; Furnaces with rotating floor</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0043" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0043</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Muffle furnaces; Retort furnaces</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/005" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Furnaces in which the charge is moving up or down </text><reference><text>for wire, strip <class-ref scheme="cpc">C21D9/54</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0056" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0056</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Furnaces through which the charge is moved in a horizontal straight path </text><reference><text><class-ref scheme="cpc">C21D9/0043</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0062" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0062</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Heat-treating apparatus with a cooling or quenching zone</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0068" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for particular articles not mentioned below</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0075" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0075</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for rods of limited length </text><reference><text>of unlimited length <class-ref scheme="cpc">C21D9/52</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0081" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for slabs; for billets</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0087" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0087</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for chains, for chain links</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/0093" definition-exists="false" ipc-concordant="C21D9/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/0093</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for screws; for bolts</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/02" definition-exists="false" ipc-concordant="C21D9/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for springs</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/04" definition-exists="false" ipc-concordant="C21D9/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D9/04</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>for rails</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/06" definition-exists="false" ipc-concordant="C21D9/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with diminished tendency to become wavy</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/08" definition-exists="false" ipc-concordant="C21D9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for tubular bodies or pipes</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/085" definition-exists="false" ipc-concordant="C21D9/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/085</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cooling or quenching</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/10" definition-exists="false" ipc-concordant="C21D9/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>shotgun barrels</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/12" definition-exists="false" ipc-concordant="C21D9/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>barrels for ordnance</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/14" definition-exists="false" ipc-concordant="C21D9/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D9/14</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>wear-resistant or pressure-resistant pipes</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/16" definition-exists="false" ipc-concordant="C21D9/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for explosive shells</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/18" definition-exists="false" ipc-concordant="C21D9/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for knives, scythes, scissors, or like hand cutting tools</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/20" definition-exists="false" ipc-concordant="C21D9/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for blades for skates</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/22" definition-exists="false" ipc-concordant="C21D9/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for drills</text></title-part><title-part><text>for milling cutters</text></title-part><title-part><text>for machine cutting tools</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/24" definition-exists="false" ipc-concordant="C21D9/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/24</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for saw blades</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/26" definition-exists="false" ipc-concordant="C21D9/26" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/26</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for needles</text></title-part><title-part><text>for teeth for card-clothing</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/28" definition-exists="false" ipc-concordant="C21D9/28" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/28</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for plain shafts</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/30" definition-exists="false" ipc-concordant="C21D9/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for crankshafts</text></title-part><title-part><text>for camshafts</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/32" definition-exists="false" ipc-concordant="C21D9/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for gear wheels, worm wheels, or the like</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/34" definition-exists="false" ipc-concordant="C21D9/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/34</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for tyres</text></title-part><title-part><text>for rims</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/36" definition-exists="false" ipc-concordant="C21D9/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/36</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for balls</text></title-part><title-part><text>for rollers</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/38" definition-exists="false" ipc-concordant="C21D9/38" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/38</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for roll bodies</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/40" definition-exists="false" ipc-concordant="C21D9/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/40</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for rings</text></title-part><title-part><text>for bearing races</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/42" definition-exists="false" ipc-concordant="C21D9/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/42</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for armour plate</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/44" definition-exists="false" ipc-concordant="C21D9/44" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D9/44</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>for equipment for lining mine shafts, e.g. segments, rings or props</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/46" definition-exists="false" ipc-concordant="C21D9/46" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/46</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for sheet metals</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/48" definition-exists="false" ipc-concordant="C21D9/48" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/48</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>deep-drawing sheets</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/50" definition-exists="false" ipc-concordant="C21D9/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/50</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for welded joints</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/505" definition-exists="false" ipc-concordant="C21D9/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/505</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cooling thereof</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/52" definition-exists="false" ipc-concordant="C21D9/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D9/52</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>for wires</text></title-part><title-part><text>for strips </text><CPC-specific-text><text>; for rods of unlimited length</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/525" definition-exists="false" ipc-concordant="C21D9/52" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/525</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for wire, for rods </text><reference><text><class-ref scheme="cpc">C21D9/54</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="C21D9/54" definition-exists="false" ipc-concordant="C21D9/54" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/54</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Furnaces for treating strips or wire</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D9/56" definition-exists="false" ipc-concordant="C21D9/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/56</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Continuous furnaces for strip or wire</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/561" definition-exists="false" ipc-concordant="C21D9/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/561</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a controlled atmosphere or vacuum</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/562" definition-exists="false" ipc-concordant="C21D9/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/562</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C21D9/563" definition-exists="false" ipc-concordant="C21D9/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/563</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Rolls; Drums; Roll arrangements</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C21D9/564" definition-exists="false" ipc-concordant="C21D9/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/564</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tension control</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C21D9/565" definition-exists="false" ipc-concordant="C21D9/56" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/565</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Sealing arrangements</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/567" definition-exists="false" ipc-concordant="C21D9/567" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/567</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with heating in fluidised beds</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/573" definition-exists="false" ipc-concordant="C21D9/573" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/573</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with cooling</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C21D9/5732" definition-exists="false" ipc-concordant="C21D9/573" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/5732</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of wires; of rods</text></CPC-specific-text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C21D9/5735" definition-exists="false" ipc-concordant="C21D9/573" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/5735</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details</text></CPC-specific-text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="C21D9/5737" definition-exists="false" ipc-concordant="C21D9/573" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/5737</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Rolls; Drums; Roll arrangements</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/58" definition-exists="false" ipc-concordant="C21D9/58" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/58</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with heating by baths</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/60" definition-exists="false" ipc-concordant="C21D9/60" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/60</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with induction heating</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/62" definition-exists="false" ipc-concordant="C21D9/62" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/62</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with direct resistance heating</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/63" definition-exists="false" ipc-concordant="C21D9/63" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/63</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>the strip being supported by a cushion of gas</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D9/64" definition-exists="false" ipc-concordant="C21D9/64" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/64</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Patenting furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D9/66" definition-exists="false" ipc-concordant="C21D9/66" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/66</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Tower-type furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D9/663" definition-exists="false" ipc-concordant="C21D9/663" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/663</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bell-type furnaces</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/665" definition-exists="false" ipc-concordant="C21D9/665" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/665</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>inverted or side-facing</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/667" definition-exists="false" ipc-concordant="C21D9/667" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/667</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Multi-station furnaces</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="C21D9/67" definition-exists="false" ipc-concordant="C21D9/67" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2014-02-04" status="published"><classification-symbol>C21D9/67</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>adapted for treating the charge in vacuum or special atmosphere</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/673" definition-exists="false" ipc-concordant="C21D9/673" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/673</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Details, accessories, or equipment peculiar to bell-type furnaces</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/675" definition-exists="false" ipc-concordant="C21D9/675" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2014-02-04" status="published"><classification-symbol>C21D9/675</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements of charging or discharging devices</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="C21D9/677" definition-exists="false" ipc-concordant="C21D9/677" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2014-02-04" status="published"><classification-symbol>C21D9/677</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrangements of heating devices</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="C21D9/68" definition-exists="false" ipc-concordant="C21D9/68" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D9/68</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Furnace coilers</text></title-part><title-part><text>Hot coilers </text><reference><text>cold coilers <class-ref scheme="cpc">B21C47/00</class-ref></text></reference></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D9/70" definition-exists="false" ipc-concordant="C21D9/70" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D9/70</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Furnaces for ingots, i.e. soaking pits</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21D10/00" definition-exists="true" ipc-concordant="C21D10/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D10/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Modifying the physical properties by methods other than heat treatment or deformation</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D10/005" definition-exists="false" ipc-concordant="C21D10/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D10/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by laser shock processing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="C21D11/00" definition-exists="true" ipc-concordant="C21D11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>C21D11/00</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Process control or regulation for heat treatments</text></title-part></class-title>
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<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="C21D11/005" definition-exists="false" ipc-concordant="C21D11/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D11/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for cooling</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="true" level="6" additional-only="true" sort-key="C21D201/00" date-revised="2013-01-01" status="published"><classification-symbol>C21D2201/00</classification-symbol>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21D201/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2201/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Treatment for obtaining particular effects</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D201/01" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2201/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Shape memory effect</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D201/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2201/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Superplasticity</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D201/03" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2201/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amorphous or microcrystalline structure</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D201/04" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2201/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Single or very large crystals</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D201/05" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2201/05</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Grain orientation</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21D211/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2211/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Microstructure comprising significant phases</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D211/001" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2211/001</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Austenite</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D211/002" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2211/002</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Bainite</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D211/003" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2211/003</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Cementite</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D211/004" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2211/004</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Dispersions</text></title-part><title-part><text>Precipitations</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D211/005" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2211/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Ferrite</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D211/007" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2211/007</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Ledeburite</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D211/008" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2211/008</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Martensite</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D211/009" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2211/009</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pearlite</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21D221/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2221/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Treating localised areas of an article</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D221/01" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2221/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>End parts (e.g. leading, trailing end)</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D221/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2221/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Edge parts</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D221/10" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2221/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21D241/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2241/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Treatments in a special environment</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D241/01" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2241/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>under pressure</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="C21D241/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2241/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Hot isostatic pressing</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D241/03" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-02-01" status="published"><classification-symbol>C21D2241/03</classification-symbol><class-title date-revised="2017-02-01"><title-part><text>in zero gravity (e.g. in space)</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21D251/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2251/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Treating composite or clad material</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D251/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2251/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Clad material</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D251/04" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2251/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Welded or brazed overlays</text></title-part></class-title></classification-item></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21D261/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2261/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Machining or cutting being involved</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="C21D281/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2281/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Making use of special physico-chemical means</text></title-part></class-title>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D281/01" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2281/01</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Seed crystals being used</text></title-part></class-title></classification-item>
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<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="C21D281/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>C21D2281/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>temperature gradient</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></class-scheme> |