一、前言随着我国机械工业的发展,对产品质量的要求,日益提高。因此合理的选用廉价金属材料,通过热处理手段,以提高产品零件的质量,多快好省地建设社会主义,是我们机械制造工作者所面对的重要课题之一。产品零件的质量优劣,不仅关系到其使用寿命的长短,而且直接影响到它的正常工作和运转。在一定条件下,材料热处理工艺的正确 I. Introduction With the development of China’s machinery industry, the requirements for product quality are increasing day by day. Therefore, reasonable selection of cheap metal materials, through the means of heat treatment, in order to improve the quality of product parts, build socialism more quickly and economically, is one of the important topics that we machinery manufacturers face. The quality of the product parts, not only related to the length of its useful life, but also directly affect its normal work and operation. Under certain conditions, the material heat treatment process is correct