一、前言 60Si2Mn钢是一种常用的弹簧钢,也被用于风铲、冲击钻探工具,显示出相当好的工作性能。由于它具有高强度、高疲劳极限和较好的塑性韧性,近几年来我国也用于制造中小型冷作模具,如内外六角螺栓成型冷镦冲头、六角螺母压角冲填、中、厚钢板穿孔冲头,具有较高的使用寿命,在某种程度上比典型的冷作模具钢Cr12MoV还好。但是,尽管各个工厂采用相同的最终热处理工艺,可是模具的使用寿命有较大的差别。我们通过调查,发现除了工作条件有差异外,各厂家在最终热处理之前原始 I. Introduction 60Si2Mn steel is a commonly used spring steel, also used in wind shovels, impact drilling tools, showing a very good working performance. Because of its high strength, high fatigue limit and good ductility, in recent years China is also used to manufacture small and medium-sized cold-working die, such as the formation of internal and external hex bolts cold heading punch, hex nut angle filling, in the thick Steel punch punches, with a higher life expectancy, to some extent, better than the typical cold work die steel Cr12MoV. However, although the same final heat treatment process is used at each plant, there is a large difference in the service life of the mold. We through the survey found that in addition to the differences in working conditions, the manufacturers before the final heat treatment of the original