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C21 - Metallurgy of iron
More topics under "C21 - Metallurgy of iron" (146,431)
C21B - Manufacture of iron or steel
(26,159)
C21C - Processing of pig-iron, e.g. refining, manufacture of wrought-iron or steel; Treatment in molten state of ferrous alloys
(29,039)
C21D - Modifying the physical structure of ferrous metals; General devices for heat treatment of ferrous or non-ferrous metals or alloys; Making metal malleable by decarburisation, tempering, or other treatments
(91,233)