C22

METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

Note(s) Processes or devices specific to the transformation of iron ore or iron carbonyl into iron, either solid or molten, are classified in subclass C21B [2012 01]Processes or devices specific to: processing of pig-iron or cast iron;manufacture of wrought-iron, wrought-steel or carbon steel;treatment in molten state of ferrous alloys; are classified in subclass C21C The following processes or devices are classified in subclass C21D: processes specific to heat treatment of ferrous alloys or steels;devices for heat treatment of metals or alloys