问题补充：
普通热处理分为退火、正火、淬火和回火.退火是将钢加热到预定温度,保温一定时间后缓慢冷却（通常随炉冷不好意思，我怎么一次没发完接着发普通热处理分为退火、正火、淬火和回火。退火是将钢加热到预定温度，保温一定时间后缓慢冷却（通常随炉冷却），获得接近于平衡组织的热处理工艺。正火是将钢加热到亚共析钢或共析和过共析钢以上30-50℃，保温适当时间后在静止空气中冷却的热处理工艺。淬火是将钢加热到亚共析钢或AC1以上30-50℃，经过保温后在冷却介质中迅速冷却的热处理工艺。回火是把经过淬火的零件重新加热到低于AC1的某一温度，适当保温后，冷却到室温的热处理工艺。
答案：
【答案】 给您专业的翻译!
普通热处理分为退火、正火、淬火和回火.
The types of ordinary heat treatment of steel are annealing,normalizing,quenching and tempering.
退火是将钢加热到预定温度,保温一定时间后缓慢冷却（通常随炉冷却）,获得接近于平衡组织的热处理工艺.
Annealing is a treatment process of steel by heating to a predetermined temperature,holding for a certain time,and then cooling slowly to room temperature (normally together with the furnace),so that the equilibrium microstructure is obtained.
正火是将钢加热到亚共析钢或共析和过共析钢以上30-50℃,保温适当时间后在静止空气中冷却的热处理工艺.
Normalizing is a treatment process of steel by heating to 30-50℃ above temperature level of hypoeutectoid steel or eutectoid and hyper-eutectoid steel,holding for a suitable time and then cooling in still air.
淬火是将钢加热到亚共析钢或AC1以上30-50℃,经过保温后在冷却介质中迅速冷却的热处理工艺.
Quenching is a treatment process of steel by heating to 30-50℃ above temperature level of hypoeutectoid steel or Ac1 (正确写法是用小写c),it is then rapidly cooled in cooling agent after holding.(据我了解,淬火似乎不需要保温).
回火是把经过淬火的零件重新加热到低于AC1的某一温度,适当保温后,冷却到室温的热处理工艺.
Tempering is a treatment process of steel by reheating the quenched components to a temperature below Ac1,after appropriate holding time,and then cooling to room temperature.
【英语牛人团】
