回火：将已经淬硬的钢材再加热到低于临界点以下的某一温度，保温一定时间然后根据要求冷却到一定温度的工艺；
TEMPER : Process of re-heating hardened steel to a temperature below critical temperature followed by a desired rate of cooling;
试验研究发现，磨削淬硬的磨削力比值范围与磨削淬火钢的磨削力比值范围相一致，大于磨削普通钢的磨削力比值范围。
The grinding force ratio in grind-hardening consists with the grinding force ratio in grinding quenched steel, and is bigger than the grinding force ratio in grinding unquenched steel.
该仪器完全能满足生产实际对淬硬层深度的测量要求。
This instrument can meet the need of actual manufacture for hardness depth measurement.
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