C21B MANUFACTURE OF IRON OR STEEL
Introduced: September 1968
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- METALLURGY OF IRON
- Subclass:
- MANUFACTURE OF IRON OR STEEL
Description
C21B covers the production processes and technologies for manufacturing iron and steel, including ore reduction, pig iron production, and steel-making methods. The subclass encompasses both traditional and modern techniques such as blast furnace operation, direct reduction processes, electric arc furnace steelmaking, and oxygen converter steelmaking. It includes related aspects of heat treatment, casting, and refining of steel products during manufacture. Adjacent class C21C addresses the processing and treatment of steel after initial manufacture, while C21B focuses on the primary conversion and formation stages from raw materials to finished steel products.
Scope Notes
Glossary: Pig iron intermediate product of smelting iron ore with a high-carbon fuel, e.g. coke, charcoal Slag partially vitreous by-product of smelting ore to separate the metal fraction form the unwanted faction Tuyères tubes, nozzles or pipes through which air is blown into a furnace | Limiting references: Preliminary treatment of ferrous ores or scrap Constructional features of mixers for pig-iron Electrolytic production, recovery or refining of iron group metals
Related Keywords
7 direct subcodes
Child Classifications
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- C21B 11/00 Making pig-iron other than in blast furnaces
- C21B 13/00 Making spongy iron or liquid steel, by direct processes
- C21B 15/00 Other processes for the manufacture of iron from iron compounds
- C21B 3/00 General features in the manufacture of pig-iron
- C21B 5/00 Making pig-iron in the blast furnace
- C21B 7/00 Blast furnaces
- C21B 9/00 Stoves for heating the blast in blast furnaces