what is the meaning of "snap draw"

sbm197873

Snap Draw. Steels that are susceptible to cracking at room temperature after hardening are given a low-temperature tempering treatment(a snap draw) immediately after hardening and prior to final tempering in fixtures.

hyhaha

我是这样理解的，对于像5CrMnMo等大型模具钢，淬火后不能一直冷到室温，而是要在冒青烟（160度左右）时进行及时阶梯回火，避免裂纹产生，因此我认为，A snap draw 的意思是低温及时回火处理（低温防裂纹处理/低温融合处理）

aoao

楼上理解正确，也叫快速回火

身在此山

aoao 发表于 2016-5-17 15:14
楼上理解正确，也叫快速回火

译为 “立即回火” 更恰当。