1.1 本规范 2. 涵盖了压力容器、等静压机、冲击管和类似部件用高强度调质合金钢锻件的要求。 1.2 这些材料不适用于焊接结构。 1.3 包括三个等级的镍铬钼钢和六个等级的抗拉强度增加的钢。锻件的强度等级、截面尺寸和配置将在很大程度上决定适用的钢材类型。 1.4 以英寸磅单位或国际单位制（公制）单位表示的数值应单独视为标准。在文本和表格中，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 除非订单规定了适用的“M”规格名称，否则材料应按英寸磅单位提供。 1.6 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 requirements for high-strength quenched and tempered alloy steel forgings for pressure vessels, isostatic presses, shock tubes, and similar components. 1.2 These materials are not intended for welded construction. 1.3 Three grades of nickel-chromium-molybdenum steels and six classes of increasing tensile strength are included. The strength class, section size, and configuration of the forging will largely dictate the applicable type(s) of steel. 1.4 The values stated in either inch-pound units or SI (metric) units are to be regarded separately as the standard. Within the text and tables, 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 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units. 1.6 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.