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| SECTION C– CHEMISTRY; METALLURGY |
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| C 21 | METALLURGY OF IRON |
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| C 21 C | PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL (refining or remelting metals in general C 22 B 9/00) |
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1/ | 00 | Refining of pig-iron; Cast iron |
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1/ | 02 | . | Dephosphorising or desulfurising |
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1/ | 04 | . | Removing impurities other than carbon, phosphorus, or sulfur |
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1/ | 06 | . | Constructional features of mixers for pig-iron |
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1/ | 08 | . | Manufacture of cast-iron |
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1/ | 10 | . | Making spheroidal graphite cast-iron |
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3/ | 00 | Manufacture of wrought-iron or wrought-steel |
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5/ | 00 | Manufacture of carbon steel, e.g. plain mild steel, medium carbon steel, or cast-steel |
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5/ | 02 | . | Crucible furnace processes |
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5/ | 04 | . | Manufacture of hearth-furnace steel, e.g. Siemens-Martin steel |
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5/ | 06 | . | . | Processes yielding slags of special composition |
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5/ | 28 | . | Manufacture of steel in the converter |
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5/ | 30 | . | . | Regulating or controlling the blowing |
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5/ | 32 | . | . | . | Blowing from above (C 21 C 5/35 takes precedence) [5] |
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5/ | 34 | . | . | . | Blowing through the bath (C 21 C 5/35 takes precedence) [5] |
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5/ | 35 | . | . | . | Blowing from above and through the bath [5] |
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5/ | 36 | . | . | Processes yielding slags of special composition |
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5/ | 38 | . | . | Removal of waste gases or dust |
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5/ | 40 | . | . | . | Offtakes or separating apparatus for converter waste gases or dust |
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5/ | 42 | . | . | Constructional features of converters |
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5/ | 44 | . | . | . | Refractory linings |
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5/ | 46 | . | . | . | Details or accessories |
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5/ | 48 | . | . | . | . | Bottoms or tuyères of converters |
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5/ | 50 | . | . | . | . | Tilting mechanisms for converters |
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5/ | 52 | . | Manufacture of steel in electric furnaces (electric heating per se H 05 B) |
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5/ | 54 | . | . | Processes yielding slags of special composition |
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5/ | 56 | . | Manufacture of steel by other methods (making liquid steel by direct processes C 21 B 13/00) |
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7/ | 00 | Treating molten ferrous alloys, e.g. steel, not covered by groups C 21 C 1/00 to C 21 C 5/00 (treating molten metals during moulding B 22 D 1/00, B 22 D 27/00; remelting ferrous metals C 22 B) |
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7/ | 04 | . | Removing impurities by adding a treating agent |
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7/ | 06 | . | . | Deoxidising, e.g. killing [2] |
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7/ | 064 | . | . | Dephosphorising; Desulfurising [3] |
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7/ | 068 | . | . | Decarburising [3] |
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7/ | 072 | . | . | Treatment with gases (C 21 C 7/06, C 21 C 7/064, C 21 C 7/068 take precedence) [3] |
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7/ | 076 | . | . | Use of slags or fluxes as treating agents (C 21 C 7/06, C 21 C 7/064, C 21 C 7/068 take precedence) [3] |
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7/ | 10 | . | Handling in vacuum |
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