CPC Main Group
C21B 13/00 Making spongy iron or liquid steel, by direct processes
16 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 13/10 in hearth-type furnaces
- C21B 13/12 in electric furnaces
- C21B 13/14 Multi-stage processes