1.1 本规范 2. 涵盖了三种等级的碳锰硅钢板，主要用于焊接压力容器，在这些容器中，提高低温缺口韧性很重要。 1.2 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。 1.3 对于由卷材制成且未经热处理或仅进行应力消除的板材，规范的附加要求，包括附加测试要求和附加测试结果的报告 20米/20米 申请。 1.4 以英寸-磅单位或国际单位表示的值应单独视为标准值。在文本中，国际单位制显示在括号中。每个系统中所述的值不是完全等效的；因此，每个系统都必须独立使用。 结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 plates intended primarily for service in welded pressure vessels where improved low temperature notch toughness is important. 1.2 The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements. 1.3 For plates produced from coil and furnished without heat treatment or with stress relieving only, the additional requirements, including additional testing requirements and the reporting of additional test results, of Specification A20/A20M apply. 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.