1.1 本规范 2. 包括三个等级的碳锰硅钢，指定为A级、B级和C级。C级可通过添加硼来生产。这些板材经过淬火和回火处理，适用于焊接分层压力容器。 1.2 根据本规范提供的板材的最大厚度仅受化学成分满足规定机械要求的能力的限制。然而，目前的做法通常将最大厚度限制为 7. / 8. A级和B级为22毫米，C级为2毫米[50毫米。 1.3 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，每个系统都必须独立使用。将两个系统的值组合在一起可能会导致不符合规范。 1.4 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 three grades of carbon-manganese-silicon steel, designated Grades A, B, and C. Grade C may be produced with a boron addition. The plates are quenched and tempered and are intended for welded-layered pressure vessels. 1.2 The maximum thickness of plates supplied under this specification is limited only by the capability of the chemical composition to meet the specified mechanical requirements. However, current practice normally limits the maximum thickness to 7 / 8 in. [22 mm] for Grades A and B, and to 2 in. [50 mm] for Grade C. 1.3 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. 1.4 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.