1.1 本说明书涵盖由球墨铸铁制成的铸件，球墨铸铁也称为球墨铸铁或球墨铸铁，其被描述为具有基本上球形形状的石墨并且基本上不含术语中定义的其他形式的石墨的铸铁 A644 . 1.2 在同一铸件不同位置的铁的性能之间，或者铸件的性能与由同一铁铸造的试样的性能之间，没有精确的定量关系（见 附录X1 ). 1.3 以英寸-磅单位表示的值应被视为标准值。表1和表2中给出的SI值是对SI单位的数学转换，仅供最低机械性能参考，不被视为标准。 1.4 本国际标准是根据《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的世界贸易组织技术性贸易壁垒（TBT）委员会发布的结论。

1.1 This specification covers castings made of ductile iron, also known as spheroidal or nodular iron, which is described as cast iron with the graphite substantially spheroidal in shape and essentially free of other forms of graphite, as defined in Terminology A644 . 1.2 No precise quantitative relationship can be stated between the properties of the iron in various locations of the same casting or between the properties of castings and those of a test specimen cast from the same iron (see Appendix X1 ). 1.3 The values stated in inch-pound units are to be regarded as standard. The SI values given in Tables 1 and 2 are mathematical conversions to SI units that are provided for information only for minimum mechanical properties and are not considered standard. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.