回火是将淬火钢加热到Ac1以下的某一温度，保温必然光阴，而后冷却到室温的热处分工艺。它的要紧目的为：

（1）合理地调解钢的硬度和强度，进步钢的韧性，使工件满足应用要求；

（2）稳定构造，使工件在永远应用历程当中不发生构造转变，从而稳定工件的样式与尺寸；

（3）ƒ低落或消除工件的淬火内应力，以削减工件的变形，并防止开裂。

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Tempering is a process in which the quenched steel is heated to a temperature below Ac1, the heat is inevitable, and then cooled to room temperature. Its main purpose is:

(1) Reasonably adjust the hardness and strength of the steel, improve the toughness of the steel, and make the workpiece meet the application requirements;

(2) Stable structure, so that the workpiece does not undergo structural transformation during the permanent application process, thereby stabilizing the style and size of the workpiece;

(3) The low internal pressure of the workpiece is reduced or eliminated to reduce the deformation of the workpiece and prevent cracking.