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各种制造刀具用的高速钢胚料,在钢厂出厂以前,大都经过退火处理,因此它的硬度一般都在 HB205～255。由于在退火时冷却过程很长,因此在钢料晶粒的边缘,会析出很细小的合金化合物,使钢料的加工性能和塑性都很低。为了改善它的加工性能和塑性,可用下列的方法:一、把没有经过锻造的高速钢胚料(即已经在钢厂内退过火的热轧型钢),放在箱式炉或盐浴炉内加热到720°～740℃,根据
All kinds of high-speed steel billets used for making knives are mostly annealed before they leave the factory. Therefore, their hardness is generally in the range of HB205 ~ 255. Due to the long cooling process during annealing, very small alloy compounds are precipitated at the edges of the steel grain, resulting in poor machinability and plasticity of the steel. In order to improve its processing performance and plasticity, the following methods can be used: First, the high-speed steel billet that has not been forged (ie, hot-rolled steel that has been reheated in a steel mill) is heated in a box furnace or a salt bath furnace To 720 ° ~ 740 ℃, according to