回火是將淬火鋼加熱到Ac1以下的某一溫度，保溫必然光陰，而后冷卻到室溫的熱處分工藝。它的要緊目的為：

（1）合理地調解鋼的硬度和強度，進步鋼的韌性，使工件滿足應用要求；

（2）穩(wěn)定構造，使工件在永遠應用歷程當中不發(fā)生構造轉變，從而穩(wěn)定工件的樣式與尺寸；

（3）?低落或消除工件的淬火內應力，以削減工件的變形，并防止開裂。

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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.