A tendency to harden by rapid cooling necessitates the use of preheat to remove the quench effect of cold metal, and to reduce the cooling rate.
强化的趋势迅速冷却，有必要制定预热来消除冷金属淬火效果，并减少冷却速率。
A tendency to harden by rapid cooling necessitates the use of preheat to remove the quench effect of cold metal, and to reduce the cooling rate.
强化的趋势迅速冷却，有必要制定预热来消除冷金属淬火效果，并减少冷却速率。
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