1.1 本规范 2. 涵盖用于熔焊锅炉和其他压力容器的高强度调质合金钢板。 1.2 本规范包括由不同生产商生产的多个等级，但均具有相同的机械性能和一般特性。 1.3 根据本规范提供的板材的最大厚度应如下所示: 等级 厚 A、 B 1.25英寸[32毫米] H、 S 2英寸[50毫米] P 4英寸[100毫米] F 2.50英寸[65毫米] E、 Q 6英寸[150毫米] 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，在不以任何方式组合值的情况下，每个系统将独立于其他系统使用。 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 high-strength quenched and tempered alloy steel plates intended for use in fusion welded boilers and other pressure vessels. 1.2 This specification includes a number of grades as manufactured by different producers, but all having the same mechanical properties and general characteristics. 1.3 The maximum thickness of plates furnished under this specification shall be as follows: Grade Thickness A, B 1.25 in. [32 mm] H, S 2 in. [50 mm] P 4 in. [100 mm] F 2.50 in. [65 mm] E, Q 6 in. [150 mm] 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 is to be used independently of the other without combining values in any way. 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.