PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS (refining metals in general C22B9/00)

Introduced: September 1968

Description

C21C covers the refining of pig iron and the production of wrought iron and steel through various metallurgical processes, including treatment of ferrous alloys in their molten state. This subclass encompasses converters, furnaces, and processing methods designed to remove impurities and adjust chemical composition to achieve desired steel grades and properties. Technologies include basic oxygen processes, electric arc furnace operations, ladle metallurgy, and related thermal and chemical treatments. The scope extends to ferroalloy processing and molten metal handling techniques essential to modern steelmaking, but excludes mining, ore preparation, and the initial production of pig iron in blast furnaces (covered under C21B).

Title

Titles differ between systems:

IPC: PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

CPC: PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS (refining metals in general C22B9/00)

Full Title

Full titles differ between systems:

IPC:

PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

CPC:

PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS (refining metals in general C22B9/00)

Of 8 combined children, 4 exist in both systems.

4 codes are CPC-only extensions.

Note: 4 CPC extensions are marked as secondary classification only.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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C21C 1/00 Refining of pig-iron; Cast iron IPC+CPC Available in IPC and CPC
C21C 2100/00 Exhaust gas 2nd only +3 CPC CPC only CPC only
C21C 2200/00 Recycling of waste material 2nd only CPC only CPC only
C21C 2250/00 Specific additives; Means for adding material different from burners or lances 2nd only +4 CPC CPC only CPC only
C21C 2300/00 Process aspects 2nd only +4 CPC CPC only CPC only
C21C 3/00 Manufacture of wrought-iron or wrought-steel IPC+CPC Available in IPC and CPC
C21C 5/00 Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel +1 CPC IPC+CPC Available in IPC and CPC
C21C 7/00 Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 (treating molten metals during moulding B22D1/00, B22D27/00; remelting ferrous metals C22B) +10 CPC IPC+CPC Available in IPC and CPC