1.1 本规范涵盖由高硅钼铁素体铁（通常称为SiMo）制成的铸件。本规范包括具有球状石墨（SG）SiMo铁、蠕墨（CG）SiMo铁和混合石墨或中等球化石墨（MG）SiMo铁微观结构的铸件。镁铁微观结构由球状和蠕墨形状的混合物组成。本标准规定了三个等级铁素体铸铁的条件、化学成分、微观结构和其他技术要求，规定为SG SiMo、MG SiMo和CG SiMo。 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。 1.3 以国际单位制表示的数值应视为标准值。所有化学成分均以质量百分比表示。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This specification covers castings made of high-silicon molybdenum ferritic iron, commonly known as SiMo. This specification includes castings with microstructures of spheroidal graphite (SG) SiMo iron, compacted graphite (CG) SiMo iron, and mixed graphite or medium-nodularity graphite (MG) SiMo iron. MG iron microstructure comprises a mixture of spheroidal and compacted graphite shapes. This standard specifies the condition, chemical composition, microstructure, and other technical requirements of three grades of ferritic cast irons, specified as SG SiMo, MG SiMo, and CG SiMo. 1.2 No precise quantitative relationship can be stated between the properties of iron in the various locations of the same casting or between the properties of castings and those of a test specimen cast from the same iron. 1.3 The values stated in SI units are to be regarded as standard. All chemical compositions are in mass percentage. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.