1.1 本规范涵盖4英寸及以下的棒材、板材中的合金钢。结构质量的厚度和形状为[100 mm]，高温下屈服强度提高。36[250]和50[345]两个等级可用于螺栓连接或焊接建筑物或一般结构用途。2级要求最大屈服拉伸比——1级不需要该比率。 1.2 当焊接钢材时，应采用适合钢材等级和预期用途或服务的焊接工艺。见规范附录X3 A6/A6M 有关焊接性的信息。 1.3 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价物； 因此，每个系统将独立于其他系统使用，而不以任何方式组合值。 1.4 本规范的文本包含注释或脚注，或两者兼有，以提供解释性材料。此类注释和脚注（不包括表和图中的注释和脚注）不包含任何强制性要求。 1.5 对于由线圈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 1.6 在买方要求进行额外测试或附加限制的情况下，提供了补充要求。此类要求仅在采购订单中规定时适用。 1.7 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 alloy steel in bars, plates up to and including 4 in. [100 mm] in thickness and shapes of structural quality with improved yield strength at high temperature. Two grades, 36 [250] and 50 [345] are available for use in bolted or welded buildings or for general structural purposes. Class 2 requires a maximum yield to tensile ratio – this ratio is not required for Class 1. 1.2 When the steel is to be welded, a welding procedure suitable for the grade of steel and intended use or service is to 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 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 is to be used independently of the other, without combining values in any way. 1.4 The text of this specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements. 1.5 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. 1.6 Supplementary requirements are provided for use where additional testing or additional restrictions are required by the purchaser. Such requirements apply only when specified in the purchase order. 1.7 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.