该SAE标准涵盖了汽车和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。具体包括: 一个 硬度 b 抗拉强度 c 屈服强度 d 伸长率 和 弹性模量 f 冲击能量 g 微观结构 在本文档中，SI单位是主要的，1B单位是派生的。 附录A 提供有关微观结构、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: a Hardness b Tensile Strength c Yield Strength d Elongation e Modulus of Elasticity f Impact Energy g Microstructure In 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.