IPC Main Group
C21B 13/00 Making spongy iron or liquid steel, by direct processes
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- METALLURGY OF IRON
- Subclass:
- MANUFACTURE OF IRON OR STEEL
Related Keywords
making steel ALLOYSspongy IRON
7 direct subcodes
Child Classifications
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- C21B 13/02 in shaft furnaces
- C21B 13/04 in retorts
- C21B 13/06 in multi-storied furnaces
- C21B 13/08 in rotary furnaces
- C21B 13/1 in hearth-type furnaces
- C21B 13/12 in electric furnaces
- C21B 13/14 Multi-stage processes