1.1 本规范涵盖用于焊接、铆接或螺栓连接结构的高强度低合金结构钢型材、板材和棒材，主要用于节省重量[质量]或增加耐久性的结构构件。钢在大多数环境中的耐大气腐蚀性明显优于添加或不添加铜的碳结构钢。当适当暴露在大气中时，这种钢可以裸着（未上漆）用于许多应用（参见 注1 ). 本规范仅限于厚度不超过4英寸[100毫米]的材料。 注1: 有关低合金钢耐大气腐蚀性的估算方法，请参阅指南 G101 . 1.2 当要焊接钢材时，假设将使用适合钢材等级和预期用途或服务的焊接程序。见规范附录X3 A6/A6M 有关可焊性的信息。 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。将两个系统的值组合在一起可能会导致不符合规范。 1.4 对于由卷材生产且未经热处理或仅进行应力消除的结构产品，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 high-strength low-alloy structural steel shapes, plates, and bars for welded, riveted, or bolted construction intended primarily for use as structural members where savings in weight [mass] or added durability are important. The atmospheric corrosion resistance of the steel in most environments is substantially better than that of carbon structural steels with or without copper addition. When properly exposed to the atmosphere, this steel can be used bare (unpainted) for many applications (see Note 1 ). This specification is limited to material up to 4 in. [100 mm], inclusive, in thickness. Note 1: For methods of estimating the atmospheric corrosion resistance of low-alloy steels, see Guide G101 . 1.2 When 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. See Appendix X3 of Specification A6/A6M for information on weldability. 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 the specification. 1.4 For structural products 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.