汽车排气系统用不锈钢及焊管制造技术

铁素体不锈钢具有良好的耐氧化性、低的热膨胀系数、高的抗腐蚀性能以及更为经济的成本,使得铁素体不锈钢更多地用于汽车排气系统零部件。欧美及日本汽车全部使用不锈钢材料特别是铁素体不锈钢用于排气系统零部件制造以满足汽车轻量化及严格的尾气排放要求。其中,汽车排气系统中60%以上零件为管件。介绍了汽车排气系统的构成、常用不锈钢品种及各部件的性能要求,并阐述了汽车用不锈钢焊管的主要焊接加工方式。

Stainless steels for automotive exhaust system and pipes welding

The ferritic stainless steel is characterized with the better oxidation-resisting quality, lower heat expansion coefficient, higher anti-corrosion and moreover, dramatically decreased cost in economy, resulting in a large amount of ferritic stainless steel to be used more and more as the components of automotive exhaust. All of the components in exhaust system of automotive are made of the stainless steel, especially the ferritic stainless steel in Europe, the United States and Japan so as to satisfy the demand for less-weight of automotive and stringent emission of exhaust gas. In exhaust system, more than 60% of components are consisted of pipes. In this paper, the composition of automotive exhaust system, normal grades of used stainless steels and property requirements of various parts are introduced, as well as the main welding processes of welded stainless steel pipe used in automotive.