1.1 本规范 2. 覆盖用于焊接锅炉和其他压力容器的锰硅碳钢板。 1.2 本规范下的板材分两个等级生产。厚度超过1英寸时，规定的最小屈服强度降低。[25毫米]。 1.3 板材的最大厚度仅受满足规定机械性能要求的成分能力的限制。 1.4 对于由盘管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，包括附加试验要求和附加试验结果报告 A20/A20M型 申请 1.5 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，SI单位显示在括号中。每个系统中所述的值并不完全相等； 因此，每个系统必须独立于其他系统使用。组合两个系统的值可能会导致不符合规范。 1.6 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 manganese-silicon carbon steel plates for use in welded boilers and other pressure vessels. 1.2 Plates under this specification are produced in two grades. The specified minimum yield strength decreases for thicknesses over 1 in. [25 mm]. 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 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. 1.5 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. 1.6 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.