CPC Main Group
C21D 9/00 Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
34 direct subcodes
Child Classifications
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- C21D 9/02 for springs
- C21D 9/04 for rails
- C21D 9/08 for tubular bodies or pipes
- C21D 9/16 for explosive shells
- C21D 9/18 for knives, scythes, scissors, or like hand cutting tools
- C21D 9/20 for blades for skates
- C21D 9/22 for drills; for milling cutters; for machine cutting tools
- C21D 9/24 for saw blades