Heat treatment shall consist of normalizing normalizing and tempering or quenching and tempering.
热处理包括正火、正火和回火或者淬火和回火。
The procedures of heat treatment of steel include hardening tempering annealing and case hardening.
钢的热处理工序包括硬化、回火、退火和表面硬化。
There are three main operations in the heat treatment of steel: hardening tempering and annealing.
钢的热处理操作主要有三种，即：淬火、回火和退火。
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