1.1 本规范涵盖了用于桥梁和建筑物的焊接、铆接或螺栓连接施工，以及用于要求冲击性能的一般结构用途的冷成型焊接和无缝碳钢圆形、方形、矩形或特殊形状结构管。 1.2 这种管子有焊接和无缝两种尺寸，外围尺寸为88英寸。[2235 mm]或更小，且规定壁厚为0.148 in。[4毫米]至0.875英寸。[22毫米]。 1.3 焊接管和无缝管可分为两个不同等级，每个等级具有规定的冲击试验温度。 可能有不同于所列的强度水平、CVN验收标准和冲击试验温度。为确定其可用性，买方应联系生产商（参见 4.1.4 和 4.1.13 ). 1.4 以国际单位制或英寸-磅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可能不是精确的等效值；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。 除非订单中规定了本规范的“M”名称，否则英寸-磅单位应适用。 1.5 本规范的文本包含提供解释材料的注释和脚注。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。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.7 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 cold-formed welded and seamless carbon steel round, square, rectangular, or special shape structural tubing for welded, riveted, or bolted construction of bridges and buildings, and for general structural purposes where impact properties are required. 1.2 This tubing is produced in both welded and seamless sizes with a periphery of 88 in. [2235 mm] or less, and a specified wall thickness from 0.148 in. [4 mm] up to 0.875 in. [22 mm]. 1.3 The welded and seamless tubing can be supplied in two different grades each with a specified impact test temperature. Different strength levels, CVN acceptance criteria, and impact test temperatures than listed may be available. To determine their availability, the purchaser should contact the producer (see 4.1.4 and 4.1.13 ). 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be 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. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order. 1.5 The text of this specification contains notes and footnotes that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements. 1.6 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. 1.7 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.