本SAE标准涵盖了汽车及相关行业中使用的等温淬火球墨铸铁（ADI）铸件的机械和物理性能要求。具体内容包括:硬度拉伸强度磁场强度弹性模量冲击能量微观结构在本文件中，以国际单位制为主要单位，以磅为单位。附录A提供了微结构、化学和热处理要求的一般信息和相关资源，以满足ADI在特定使用条件和应用中所需的机械性能。

This SAE Standard covers the mechanical and physical property requirements for Austempered Ductile Iron (ADI) castings used in automotive and allied industries. Specifically covered are:HardnessTensile StrengthYield StrengthElongationModulus of ElasticityImpact EnergyMicrostructureIn this document SI units are primary and in-lb units are derived. Appendix A provides general information and related resources on the microstructural, chemical and heat treatment requirements to meet the mechanical properties needed for ADI in particular service conditions and applications.