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| SECTION C– CHEMISTRY; METALLURGY |
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| C 22 | METALLURGY (of iron C 21) |
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| Note |
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| The codes of subclass C 22 K are only for use as indexing codes associated with subclasses C 21 D, C 22 C or C 22 F, so as to provide information concerning changing the physical characteristics of alloys. [6] |
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| C 22 B | PRODUCTION OR REFINING OF METALS (making metallic powder or suspensions thereof B 22 F 9/00; electrolytic C 25) |
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| C 22 C | ALLOYS (flints C 06 C 15/00; treatment of alloys C 21 D, C 22 F) |
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| C 22 F | CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS OR NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C 23 and at least one process covered by this subclass C 23 F 17/00) |
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| C 22 K | INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C 21 D, C 22 C OR C 22 F, RELATING TO CHANGING THE PHYSICAL CHARACTERISTICS OF ALLOYS [6] |
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