普通炉45#钢热处理50度左右。该怎么操作？有冷却水会不会开裂？

普通炉45#钢热处理50度左右。该怎么操作？有冷却水会不会开裂？

要看零件的形状，尺寸大小，
加热到840°C左右，保温一段时间，淬入5%-8%的盐水（淬火液）中，根据形状入液时有不同方式·。前期处理好的话，零件变形量较小，开裂的可能性较小。
根据淬硬时的硬度来定回火的温度，根据尺寸大小来定回火时间。

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】