1.1 本规范涵盖无缝和电熔焊结构的锻造高强度铁素体钢对焊配件。ASME B16.9和MSS-SP-75的最新修订版中提供了配件的尺寸。与ASME B16.9不同的对焊配件应按照规范的补充要求S58提供 A960/A960M 这些配件用于高压气体和油的传输和分配系统。 1.2 当需要更大程度的检查时，为配件提供了可选的补充要求。可以在命令中指定一个或多个补充要求。 1.3 本规范不包括铸造焊接配件或由铸件加工而成的配件。 1.4 以SI单位或英寸表示的值-英镑单位应单独视为标准单位。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。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-磅单位提供。 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 covers wrought high-strength ferritic steel butt-welding fittings of seamless and electric fusion-welded construction. Dimensions of the fittings are provided in the latest revisions of ASME B16.9 and MSS-SP-75. Butt-welding fittings differing from ASME B16.9 shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M . These fittings are for use in high-pressure gas and oil transmission and distribution systems. 1.2 Optional supplementary requirements are provided for fittings when a greater degree of examination is desired. One or more of the supplementary requirements may be specified in the order. 1.3 This specification does not cover cast-welding fittings or fittings machined from castings. 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. Unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units. 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.