DIFF Subgroup
C21D 1/02 Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
Introduced: September 1968
Full Title
General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
No child classifications to compare. This is a leaf node in both IPC and CPC.