我們知道,钢件回火后的硬度,是由回火温度决定的,但适当控制回火时间,也能获得我們所需要的硬度。热处理設备較差的工厂中,在处理零件較多的情况下,由于材料和技术条件要求(主要是硬度要求)不一样,在实际工作中就要用几种不同温度来回火,很不方便。为了提高生产率和保証質量,我們試驗了在相等温度下用时間来控制硬度变化 We know that the tempering hardness of steel is determined by the tempering temperature, but proper control of tempering time, but also to get the hardness we need. In the factories where the heat treatment equipment is poor, when there are many parts to be processed, due to the different material and technical requirements (mainly the hardness requirements), it is very inconvenient to use several different tempering temperatures in actual work. In order to improve productivity and ensure quality, we tested the temperature at equal temperature with time to control the hardness changes