汽车排气歧管材料现状及发展趋势

Present Situation and Development Tendency of Materials Used for Automotive Exhaust Manifold

介绍了汽车排气歧管的功能、结构特点和失效形式,认为排气歧管材料应耐热性好、耐热疲劳性好、高温强度高、加工性能好和铸造成形性好。概述了我国排歧气管用材料现状及发展动向,指出铸态高铁素体量球铁、蠕墨铸铁、中Si-Mo球铁、高Ni奥氏体球铁排气歧管的生产要点。

The function,configuration characteristics and failure modes of the automotive exhaust manifold were introduced.It＇s considered that the materials used for exhaust manifolds must have high heat resistance,high strength at high temperature,good machinability and cast-ability.The present situation and development tendency of materials used for exhaust manifolds of China was summarized,and the production outlines of as-cast high-ferrite content nodular iron,vermicular iron,medium Si-Mo nodular iron and high Ni austenite nodular iron manifolds were described.