本SAE标准涵盖了汽车及相关行业高温用球墨铸铁铸件的硬度、化学分析和微观结构要求。通常被称为SiMo球墨铸铁，典型应用于活塞式发动机排气歧管和涡轮增压器零件。铸件可在铸态或热处理状态下指定。出于设计目的，本附录提供了有关高温球墨铸铁件应用、加工条件、化学成分、机械性能和微观结构的一般信息。

This SAE Standard covers the hardness, chemical analysis and microstructural requirements for ductile iron castings intended for high temperature service in automotive and allied industries. Commonly known as SiMo ductile iron, typical applications are in piston-engine exhaust manifolds and turbocharger parts. Castings may be specified in the as-cast or heat treated condition.For design purposes, the Appendix provides general information on the application of high temperature ductile iron castings, their processing conditions, chemical composition, mechanical properties and microstructure.