但油淬情况就不是如此，因为油淬时在淬火临界阶段零件表面的温度可能仍然很高。
This is not true in oil quenching, when the surface temperature may be high during the critical stages of quenching.
淬火。这个工艺是把材料加热到临界温度范围之上，然后迅速冷却到临界温度范围以下，使钢材明显变硬。
Hardening. This is the process of heating to a temperature above the critical range, and cooling rapidly enough through the critical range to appreciably harden the steel.
淬火就是把钢件加热到或超过它的临界温度范围，然后使其快速冷却的过程。
Hardening is the process of heating a piece of steel to a temperature within or above its critical range and then cooling it rapidly.
淬火就是把钢件加热到或超过它的临界温度范围，然后使其快速冷却的过程。
Hardening is the process of heating a piece of steel to a temperature within or above its critical range and then cooling it rapidly.
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