1.1 本规范 2. 覆盖由热机械控制工艺（TMCP）生产的钢板。钢板主要用于焊接压力容器。TMCP方法的描述见 附录X1 . 1.2 由于TMCP方法的固有特性，在高温下无法形成板材，而不会造成强度和韧性的显著损失。除G级外，板材可在不超过1200°F[650°C]的温度下成形和焊后热处理，前提是满足以下要求: 6.1 满足。G级板材可在不超过985°F[530°C]的温度下成型，前提是符合以下要求: 6.1 满足。 1.3 根据本规范提供的板材的最大允许标称厚度为4英寸。对于A、B和C级，[100 mm]；1.5英寸。[40 mm]对于D级， 3. E、 和F；和2英寸。G级为[50 mm]。 1.4 G级易磁化。如果残余磁性对后续制造或服务有害，则应避免在热处理后的处理中使用磁铁。 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，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效值。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本规范。 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 steel plates produced by the thermo-mechanical control process (TMCP). The plates are intended primarily for use in welded pressure vessels. A description of the TMCP method is given in Appendix X1 . 1.2 Due to the inherent characteristics of the TMCP method, the plates cannot be formed at elevated temperatures without sustaining significant losses in strength and toughness. Except for Grade G, the plates may be formed and post-weld heat-treated at temperatures not exceeding 1200°F [650°C], providing the requirements of 6.1 are met. Grade G plates may be formed at temperatures not exceeding 985°F [530°C] provided the requirements of 6.1 are met. 1.3 The maximum permitted nominal thickness of plates furnished to this specification is 4 in. [100 mm] for Grades A, B, and C; 1.5 in. [40 mm] for Grades D, 3 E, and F; and 2 in. [50 mm] for Grade G. 1.4 Grade G is susceptible to magnetization. Use of magnets in handling after heat treatment should be avoided if residual magnetism would be detrimental to subsequent fabrication or service. 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 this 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.