Details or accessories

Introduced: September 1968

Last revised: January 2006

Full Title

Manufacture of carbon steel, e.g. plain mild steel, medium carbon steel, or cast-steel > Manufacture of steel in the converter > Constructional features of converters > Details or accessories

Classification Context

Section:: CHEMISTRY; METALLURGY
Class:: METALLURGY OF IRON
Subclass:: PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

Related Keywords

LANCES for steel converters

2 direct subcodes

Child Classifications

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C21C 5/48 Bottoms or tuyères of converters
C21C 5/5 Tilting mechanisms for converters

Top Applicants

Top 10 applicants by patent filingsfor class C21, 2013–2023, worldwide · Source: EPO PATSTAT

JFE STEEL JP 7,470
POSCO (POHANG IRON AND STEEL COMPANY) KR 4,615
JFE STEEL 4,538
NIPPON STEEL CORPORATION JP 4,536
ARCELORMITTAL LU 2,597
NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,241
ANGANG STEEL COMPANY 2,126
NSSMC (NIPPON STEEL & SUMITOMO METAL) 1,783
BAOSHAN IRON & STEEL COMPANY 1,620
HYUNDAI STEEL COMPANY KR 1,545