1.1 本规范涵盖了ASME B16.9、ASME B16.11、MSS SP-75、MSS SP-79、MSS-SP-83、MSS SP-95或MSS SP-97最新版本所涵盖的无缝和电熔焊结构的低碳含量热处理锻碳钢管配件。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 960米/960米 这些配件用于需要固有缺口韧性和最佳抗硫化物开裂性的压力部件，如石油和天然气工业管道和分配系统。 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。订单中可规定一项或多项补充要求。 1.3 本规范不包括铸件- 焊接配件或铸件加工配件。 1.4 以国际单位制或英寸-磅单位表示的值应单独视为标准值。在文本中，国际单位制显示在括号中。每个系统中所述的值可能不是完全等效的；因此，每个系统都应独立使用。将两个系统的值结合起来可能会导致不符合标准。除非另一方指定了适用的“M”规格名称（国际单位制），否则材料应以英寸-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 heat-treated wrought carbon steel piping fittings with lowered carbon content of seamless and electric fusion-welded construction covered by the latest revisions in ASME B16.9, ASME B16.11, MSS SP-75, MSS SP-79, MSS SP-83, MSS SP-95, or 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 components where inherent notch toughness and optimum sulfide-cracking resistance are required, such as oil and gas industry piping 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 other 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.