1.1 本规范 2. 包括非标准锻造配件、阀门部件和一般服务用零件。根据本规范制造的锻件的最大重量限制为10 000 lb【4540 kg】。可根据规范订购较大的锻件 266/a2.66米 . 1.2 涵盖了两类材料，分别指定为60类和70类，并根据中规定的机械性能进行分类 6.1 . 1.3 本规范以英寸磅单位和国际单位制表示。 然而，除非订单规定了适用的“M”规格名称（国际单位制），否则材料应以英寸磅单位提供。 1.4 以英寸磅单位或国际单位制表示的数值应单独视为标准。在文本中，国际单位制单位显示在括号中。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。将两个系统的值组合在一起可能会导致不符合规范。 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 2 covers nonstandard as-forged fittings, valve components, and parts for general service. Forgings made to this specification are limited to a maximum weight of 10 000 lb [4540 kg]. Larger forgings may be ordered to Specification A266/A266M . 1.2 Two classes of material are covered, designated as Classes 60 and 70, respectively, and are classified in accordance with their mechanical properties as specified in 6.1 . 1.3 This specification is expressed in both inch-pound units and 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 inch-pound units or SI units are to be regarded separately as 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. 1.5 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.