1.1 本规范 2 涵盖无缝和焊接结构的锻造碳钢和合金钢配件，包含在ASME B16.9、ASME B16.11、MSS SP-79、MSS SP-83、MSS SP-95和MSS SP-97的最新修订版中。与这些ASME和MSS标准不同的配件应按照规范的补充要求S58提供 A960/A960M 这些配件用于低温下的压力管道和压力容器服务。 1.2 对于需要更大程度检查的配件，提供了可选的补充要求。如果需要，应在订单中指定这些补充要求中的一项或多项。 1.3 本规范以英寸-磅单位和国际单位制单位表示。但是，除非订单规定了适用的“M”规格名称（SI单位），否则材料应按英寸提供-磅单位。 1.4 以SI单位或英寸-磅单位表示的值应单独视为标准值。在正文中，国际单位制单位显示在括号中。每个系统中陈述的值可能不完全等同；因此，每个系统应独立使用。合并两个系统的值可能导致不符合标准。 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》中确立的国际公认的标准化原则制定的。

1.1 This specification 2 covers wrought carbon steel and alloy steel fittings of seamless and welded construction, covered by the latest revision of ASME B16.9, ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, and MSS SP-97. Fittings differing from these ASME and MSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M . These fittings are for use in pressure piping and pressure vessel service at low temperatures. 1.2 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. When desired, one or more of these supplementary requirements shall be specified in the order. 1.3 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. 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 non-conformance with the standard. 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.