1.1 本规范涵盖了用于温度高达450℃的承压造纸机干燥辊的球墨铸铁件 华氏度[230 °C]。 1.2 同一铸件不同位置的铁性能之间，或铸件性能与用同一铁铸造的试样性能之间，没有精确的定量关系（见 附录X1 ). 1.3 以国际单位或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不完全相等； 因此，每个系统应独立于其他系统使用。结合两个系统的值可能会导致不符合标准。 1.3.1 例外情况- 在文本中，SI单位显示在括号中。 1.4 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 ductile iron castings for use in pressure-containing paper mill dryer rolls at temperatures up to 450 °F [230 °C]. 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 a casting and those of a test specimen cast from the same iron (see Appendix X1 ). 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.3.1 Exception— Within the text, the SI units are shown in brackets. 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.