1.1 本规范 2. 包括主要用于焊接分层压力容器的锰钒镍合金钢板。 1.2 本规范下的钢板有两种等级，具有不同的强度等级，如下所示: 等级 抗拉强度，ksi[MPa] C 105–135 [725–930] D 3英寸。[75 mm]及以下 80–105 [550–725] 大于3英寸。[75毫米] 75–100 [515–690] 1.3 板材的最大厚度仅受化学成分满足规定机械性能要求的能力限制。 1.4 以英寸-磅单位或国际单位表示的数值应单独视为标准值。在文本中，SI单位显示在括号中。每个系统中所述的值并不完全相等；因此，每个系统必须独立于其他系统使用。组合两个系统的值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（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》中确立的国际公认标准化原则制定的。

1.1 This specification 2 covers manganese-vanadium-nickel alloy steel plates intended primarily for welded layered pressure vessels. 1.2 Plates under this specification are available in two grades having different strength levels as follows: Grade Tensile Strength, ksi [MPa] C 105–135 [725–930] D 3 in. [75 mm] and under 80–105 [550–725] Over 3 in. [75 mm] 75–100 [515–690] 1.3 The maximum thickness of plates is limited only by the capacity of the chemical composition to meet the specified mechanical property requirements. 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.