1.1 本规范涵盖了用于海军舰船焊接结构的高强度低合金结构钢板，其中重量[质量]的节省非常重要。符合本规范的板材提供了改进的焊接性、成形性和韧性，这是由于特定合金元素对碳、硫和残余元素含量的限制。分数 50和 65可按要求进行轧制、控制轧制、热机械控制处理（包括加速冷却）、正火或淬火和回火，以满足规定的机械要求。 1.2 板的最大厚度或重量[质量]应如下所示: 等级 板材厚度， 最大，英寸。[毫米] 板重量[质量]， 最大，磅/英尺 2. [千克/米 2. ] 50 2 [50] 81.7 [393] 65 2. 1. / 2. [65] 102 [502] 1.3 如果要焊接钢材，则应采用适合钢材等级和预期用途或服务的焊接工艺。 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一定是精确的等价物；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 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 covers high-strength low-alloy structural steel plate intended for use in welded construction of naval ships where a savings in weight [mass] is important. Plates that conform to this specification offer improved weldability, formability, and toughness resulting from the specified alloying elements with limitations on carbon, sulfur, and residual element contents. Grades 50 and 65 may be provided as-rolled, control-rolled, thermo-mechanical control processed (including accelerated cooling), normalized, or quenched and tempered as required to meet the specified mechanical requirements. 1.2 The maximum thickness or weight [mass] of plates shall be as follows: Grade Plate thickness, max, in. [mm] Plate weight [mass], max, lb/ft 2 [kg/m 2 ] 50 2 [50] 81.7 [393] 65 2 1 / 2 [65] 102 [502] 1.3 If the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be utilized. 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 necessarily exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 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.