CPC Subgroup
C21D 1/56 characterised by the quenching agents
Full Title
General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > characterised by the quenching agents
4 direct subcodes
Child Classifications
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- C21D 1/58 Oils
- C21D 1/60 Aqueous agents
- C21D 1/607 Molten salts
- C21D 1/613 Gases; Liquefied or solidified normally gaseous material