All heat treatment by quenching and tempering. 所有萃取和回火的熱處理方法。
If a low degree of hardness is satisfactory, through-hardening is probably the most desirable heat treatment process to be used because of its inexpensiveness. 如果對強度的要求較低，整體淬火可能是最適當的熱處理方法，因為它的花費不高。
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