1.1 本规范涵盖了由压实石墨铁制成的铸件，该铸件被描述为石墨呈压实（蠕虫状）形状的铸铁，铸件中基本上不含鳞片石墨。 1.2 同一铸件不同位置的铁的性能与用同一铁铸造的试棒的性能之间没有精确的定量关系（见 附录X1 ). 1.3 以国际单位表示的数值视为标准值。本标准不包括其他计量单位。 1.3.1 例外情况- 英寸-磅单位 图。1- 3. 均为标准配置。添加SI单位仅供参考。 注1: 龙骨块的长度应为6英寸。（152毫米）。 图3 改性龙骨块模具 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers castings made of compacted graphite iron, which is described as cast iron with the graphite in compacted (vermiform) shapes and essentially free of flake graphite in the bulk of the casting. 1.2 No precise quantitative relationship can be stated between the properties of iron in the various locations of the same casting and those of a test bar cast from the same iron (see Appendix X1 ). 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1 Exception— The inch-pound units in Figs. 1- 3 are standard. SI units are added for information only. Note 1: The length of the keel block shall be 6 in. (152 mm). FIG. 3 Mold for Modified Keel Block 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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.