中文摘要：

根据实际生产的需求，选取不同比例的渗氮气氛与渗碳气氛对35CrMo钢进行了离子氮碳共渗表面化学热处理，对渗层的厚度、硬度、元素成分分布等进行了分析。实验研究结果表明，渗氮气氛与渗碳气氛的比值为6：1～10：1较为合适。经处理后的机车牵引连接销表面硬度HV0.1能达到665，渗层深度为0．16mm，满足图样技术要求。此工艺可广泛应用于高速客运机车高精度、高性能要求的牵引配件。

英文摘要：

According to the demends of manufacturing practice,this paper has done the surface chemical heat treatment to 35CrMo alloy steel with ion nitriding and carburization by choosing different proportion of nitriding atomosphere and carburization atomosphere,as well as done some analysis and description of the thickness,hardness,elements composition of the treated layer. The experiment result reveals that the most reasonable proportion of nitriding atomosphere and carburization atomosphere should be 6 ： 1-10 ： 1. After treatment the hardness of traction pin for locomotive can achieve 665 HV0.1 with thickness 0.16mm, which can meet the requirements on the drawing. This process technology can be applied widely to the traction parts with high precision and performance on high-speed passenger locomotive.