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。

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The operation consists of reheating quench-hardened steel to some temperature below the critical range followed by any rate of cooling.

回火作业包括将淬硬钢重新加热到低于临界范围的某一温度然后以任意速率冷却。

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If steel is heated slowly to a temperature just below the critical range and held there for a prolonged period of time, this structure will be obtained.

如果把钢缓慢加热到恰好低于临界温度并且保持较长一段时间，就能得到这种组织结构。

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In the process, the Navy was obliged to violate established DoD procedure concerning joint programs and to ignore the long-standing requirement of Special Operations Forces (SOF) and Navy Combat Search and Rescue (CSAR) for a system with the speed and range critical to their missions.

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