1.1 本规范涵盖标称重量为0.75的法兰U形槽钢立柱 磅/英尺至6.0 磅/英尺，标称宽度为1.25 在里面至4.0英寸。这些立柱在锻造状态下提供，用于要求高抗拉强度或耐撞性的应用，并具有低碳（LC）标志，用于要求更高延展性或改进焊接性的应用。这些材料有50多种屈服强度等级 ksi，60 克什米尔，70 ksi和80 ksi（345 兆帕，420 兆帕，485 MPa和550 MPa）。50人 ksi和60 ksi（345 MPa和420 MPa）屈服强度等级可用作低碳柱，指定为50LC或60LC级。 注1: 本规范不包括高强度低合金（HSLA）支柱。参考规范 A572/A572M型 对于HSLA。结构等级36，参考规范 A36/A36M飞机 . 1.2 单位- 以英寸-磅单位表示的数值应视为标准值。 括号中给出的值是数学转换为SI单位，仅供参考，不被视为标准单位。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 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 flanged U-channel carbon steel posts having a nominal weight ranging from 0.75 lb/ft to 6.0 lb/ft and a nominal width ranging from 1.25 in. to 4.0 in. These posts are furnished in the as-wrought condition intended for applications requiring high tensile strength or crashworthiness and with a lower carbon (LC) designation for use where higher ductility or improved weldability are required. These materials are available in multiple yield strength levels of 50 ksi, 60 ksi, 70 ksi, and 80 ksi (345 MPa, 420 MPa, 485 MPa, and 550 MPa). The 50 ksi and 60 ksi (345 MPa and 420 MPa) yield strength grades are available as lower carbon posts, designated as Grades 50LC or 60LC. Note 1: This specification does not cover high-strength low-alloy (HSLA) post. Refer to Specification A572/A572M for HSLA. For structural Grade 36, refer to Specification A36/A36M . 1.2 Units— The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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.