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。
Nitriding develops extreme hardness in the surface of steel. This hardness ranges from 900 to 1,100 Brinell, which is considerably higher than that obtained by ordinary case hardening.
渗氮在钢表面获得远远超出正常标准的硬度。其硬度范围为900到1,100布氏硬度，这远高于普通表面硬化所获得的硬度。
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。
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