1.1 本规范 2. 用于在中低温下使用的焊接压力容器的镇静碳锰硅钢板。 1.2 板材的最大厚度仅受满足规定机械性能要求的材料容量的限制。 1.3 对于由线圈生产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报告 A20/A20M 申请 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，国际单位显示在括号中。每个系统中规定的值不是精确的等价物；因此，每个系统必须相互独立使用。合并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 killed carbon-manganese-silicon steel plates intended for welded pressure vessels in service at moderate and lower temperatures. 1.2 The maximum thickness of plates is limited only by the capacity of the material 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.