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。
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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