马氏体不锈钢
Martensitic stainless steel
马氏体不锈钢常用的热处理有退火、淬火及冋火。
The commonly used heat treatment of martensitic stainless steel includes annealing, quenching and annealing.
退火后的组织为富铬的铁素体，其力学性能较低，腐蚀性也差。因此，这类钢在大多数情况下，都经淬火、回火后使用。
The microstructure after annealing is chromium rich ferrite, which has low mechanical properties and poor corrosion. Therefore, this kind of steel is used after quenching and tempering in most cases.
由于各类锻件对性能的要求不同，回火加热温度也不完全相同。
Due to different performance requirements of various forgings, the tempering heating temperature is not exactly the same.
对于需要承受冲击载荷的锻件应避开在370〜600℃内回火。
For forgings that need to bear impact load, tempering within 370 ~ 600 ℃ shall be avoided.