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    弹簧钢的回火温度是多少？ 1)弹簧钢主要是硅锰钢。硅能促进脱碳，锰能促进晶粒生长。表面脱碳和晶粒长大大大降低了军事刚性的疲劳强度，因此加热温度、加热时间和加热介质的选择和控制都要慎重。如用盐炉进行快速加热和在保护气氛下加热。淬火后应尽快回火，防止延迟断口。 2)弹簧钢含硅量高，在拉拔过程中容易发生石墨化，必须注意。一般钢在进入工厂时需要检查石墨含量。 3)回火温度一般为350 ~ 450℃。如果钢材表面状况良好(如打磨后)，应使用较低的极限温度进行回火;另外，可以利用上限值温度进行回火，提高钢的韧性，降低表面缺陷的敏感性。 What is the tempering temperature of spring steel? 1) Spring steel is mainly silico-manganese steel. Silicon can promote decarburization, and manganese can promote grain growth. Surface decarburization and grain growth greatly reduce the fatigue strength of military rigidity. Therefore, the selection and control of heating temperature, heating time and heating medium must be prudent. Such as using a salt furnace for rapid heating and heating in a protective atmosphere. After quenching, it should be tempered as soon as possible to prevent delayed fracture. 2) Spring steel has a high silicon content and is easy to graphitize during the drawing process, so attention must be paid. Generally, the graphite content of steel needs to be checked when it enters the factory. 3) The tempering temperature is generally 350 ~ 450℃. If the steel surface is in good condition (such as after grinding), a lower limit temperature should be used for tempering; in addition, the upper limit temperature can be used for tempering to improve the toughness of the steel and reduce the sensitivity to surface defects.