回火：将已经淬硬的钢材再加热到低于临界点以下的某一温度，保温一定时间然后根据要求冷却到一定温度的工艺；
TEMPER : Process of re-heating hardened steel to a temperature below critical temperature followed by a desired rate of cooling;
钢中的残余有害元素致使钢材产生红脆性表面裂纹和具有回火脆性倾向，并使耐热钢的热强性降低。
The residual deleterious elements in steel lead to products occurring red brittleness surface crack and temper brittleness, and lead to hot strength of heat resistant steel decreasing.
钢中的残余有害元素致使钢材产生红脆性表面裂纹和具有回火脆性倾向，并使耐热钢的热强性降低。
The residual deleterious elements in steel lead to the products occurring red surface brittleness crack and temper brittleness, and lead to the hot strength of heat resistant steel decreasing.
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