FI (Note)/(Index) list

Descriptions for C21B and notes/indexes are displayed on this screen.

C21B MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B 1/00)

Note(s)
    This subclass covers:
      the production of iron or steel from source materials, e.g. the production of pig-iron;apparatus specially adapted therefor, e.g. blast furnaces or air heaters.

Subclass indexes

MAKING PIG-IRON

In blast furnaces

5/00, 7/00, 9/00

Other processes

11/00

General features

3/00

MAKING IRON

13/00, 15/00

MAKING LIQUID STEEL BY DIRECT PROCESSES

13/00