Descriptions for C22 and notes/indexes are displayed on this screen.


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.