1.1 本规范涵盖三种类型和五种强度等级的高强度低合金热轧结构钢板，用于卡车框架、支架、起重臂、轨道车和类似应用。符合本规范的钢材可提高成形性。这些钢材通常在轧制状态下供应。所提供的类型和强度等级由制造商和买方商定。类型和强度等级如表所示。 1.2 板材的最大厚度应如下所示: 等级 板厚度，最大值， 英寸[mm] 50 2 [50] 60 1. 1. / 2. [40] 70 1 [25] 80 1 [25] 100 1. / 2. [13] 1.3 以英寸磅单位或国际单位制表示的数值应视为标准。在正文中，国际单位制显示在括号中。每个系统中规定的数值并不完全相等；因此，每个系统都必须独立使用。将两个系统的值结合起来可能会导致不符合本规范。 1.4 对于由卷材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的报告 A6/A6M 申请 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 covers three types and five strength grades of high-strength low-alloy, hot-rolled structural steel plate for use in truck frames, brackets, crane booms, rail cars, and similar applications. Steels that conform to this specification offer improved formability. These steels are normally furnished in the as-rolled condition. The type and strength grade furnished is as agreed upon between the manufacturer and the purchaser. The types and strength grades are shown in the tables. 1.2 The maximum thickness of plates shall be as follows: Grade Plate Thickness, max, in. [mm] 50 2 [50] 60 1 1 / 2 [40] 70 1 [25] 80 1 [25] 100 1 / 2 [13] 1.3 The values stated in either inch-pound units or SI units are to be regarded 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. 1.4 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 A6/A6M apply. 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.