1.1 本规范 2. 涵盖主要用于焊接压力容器的镍合金钢板。 1.2 本规范下的板材有四种强度等级和两种镍成分，如下所示: 等级 标称镍 含量% 屈服强度，最小值，ksi[MPa] 抗拉强度，最小值，ksi[MPa] A. 2.25 37【255】 65【450】 B 2.25 40[275] 70【485】 D 3.50 37【255】 65【450】 E 3.50 40[275] 70【485】 F 3.50 2英寸[50毫米]及以下 55[380] 80[550] 超过2英寸[50毫米] 50[345] 75【515】 1.3 板材的最大厚度仅受成分满足规定机械性能要求的能力的限制。 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。在正文中，国际单位制显示在括号中。每个系统中规定的数值并不完全相等。因此，每个系统必须独立使用。将两个系统的值结合起来可能会导致不符合本规范。 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 nickel-alloy steel plates intended primarily for welded pressure vessels. 1.2 Plates under this specification are available with four strength levels and two nickel compositions as follows: Grade Nominal Nickel Content % Yield Strength, min, ksi [MPa] Tensile Strength, min, ksi [MPa] A 2.25 37 [255] 65 [450] B 2.25 40 [275] 70 [485] D 3.50 37 [255] 65 [450] E 3.50 40 [275] 70 [485] F 3.50 2 in. [50 mm] and under 55 [380] 80 [550] Over 2 in. [50 mm] 50 [345] 75 [515] 1.3 The maximum thickness of plates is limited only by the capacity of the 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 this 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.