IPC Subgroup
C21B 13/14 Multi-stage processes
Introduced: September 1968
Last revised: January 2006
Full Title
Making spongy iron or liquid steel, by direct processes > Multi-stage processes
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- METALLURGY OF IRON
- Subclass:
- MANUFACTURE OF IRON OR STEEL