Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor

Introduced: September 1968

Of 34 combined children, 22 exist in both systems.

12 codes are CPC-only extensions.

Child Classifications

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C21D 9/0006 +3 CPC CPC only CPC only
C21D 9/0031 CPC only CPC only
C21D 9/0037 CPC only CPC only
C21D 9/0043 CPC only CPC only
C21D 9/005 CPC only CPC only
C21D 9/0056 CPC only CPC only
C21D 9/0062 CPC only CPC only
C21D 9/0068 CPC only CPC only
C21D 9/0075 CPC only CPC only
C21D 9/0081 CPC only CPC only
C21D 9/0087 CPC only CPC only
C21D 9/0093 CPC only CPC only
C21D 9/02 for springs IPC+CPC Available in IPC and CPC
C21D 9/04 for rails IPC+CPC Available in IPC and CPC
C21D 9/08 for tubular bodies or pipes +1 CPC IPC+CPC Available in IPC and CPC
C21D 9/16 for explosive shells IPC+CPC Available in IPC and CPC
C21D 9/18 for knives, scythes, scissors, or like hand cutting tools IPC+CPC Available in IPC and CPC
C21D 9/20 for blades for skates IPC+CPC Available in IPC and CPC
C21D 9/22 for drills; for milling cutters; for machine cutting tools IPC+CPC Available in IPC and CPC
C21D 9/24 for saw blades IPC+CPC Available in IPC and CPC