1.1 本规范涵盖压力系统中使用的热等静压、粉末冶金、合金钢管道部件。包括按照规定尺寸或尺寸标准（如ASME规范B16.5）制造的法兰、管件、阀门和类似零件。 1.2 本规范中包括了几种等级的合金钢。 1.3 当需要额外的测试或检查时，提供了补充要求。只有当买方在订单中单独规定时，这些规定才适用。 1.4 本规范以英寸磅单位和国际单位制表示。除非订单规定了适用的“M”规格名称（国际单位制），否则材料应按英寸提供- 磅单位。 1.5 以英寸磅单位或国际单位制表示的数值应单独视为标准。在正文中，国际单位制显示在括号中。每个系统中规定的数值并不完全相等；因此，每个系统必须相互独立地使用。将两个系统的值结合起来可能会导致不符合规范。 1.6 以下安全隐患警告仅适用于测试方法部分， 8.1 ， 8.2 和 9.5– 9.7 本规范中: 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任制定适当的安全、健康和环境实践，并在使用前确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers hot isostatically-pressed, powder metallurgy, alloy steel piping components for use in pressure systems. Included are flanges, fittings, valves, and similar parts made to specified dimensions or to dimensional standards, such as in ASME Specification B16.5. 1.2 Several grades of alloy steels are included in this specification. 1.3 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order. 1.4 This specification is expressed in both inch-pound units and in SI units. Unless the order specifies the applicable “M” specification designation (SI units), however, the material shall be furnished to inch-pound units. 1.5 The values stated in either inch-pound units or SI units are to be regarded separately as the standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. 1.6 The following safety hazards caveat pertains only to test methods portions, 8.1 , 8.2 , and 9.5 – 9.7 of this specification: 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 to determine the applicability of regulatory limitations prior to use. 1.7 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.