我厂在工具热处理方面接触到的钢种较多,几年来我们处理过88种不同钢种的工件,把这88种钢按其回火温度规范分为十类。以45钢为基准,制出回火温度表(表1)。使用时按回火的硬度要求以45钢为基准的基本温度,加上所要处理的钢种应加的规定温度,即可得出回火的温度范围,此表从1971年编出后,又经过近两年来在实践中的反复校正,证明是可用的,现 I plant in the tool heat treatment exposed more steel, the past few years we have handled 88 different types of steel workpiece, the 88 kinds of steel according to their tempering temperature is divided into ten categories. Based on 45 steel, tempering thermometer (Table 1) was made. When used according to the tempering hardness requirements of 45 steel as the base temperature, plus the steel should be dealt with the provisions of the specified temperature, tempering can draw the temperature range, the table compiled in 1971, and After nearly two years of repeated correction in practice, proved to be available, now