1.1 本规范涵盖用于焊接或螺栓结构的冷弯焊接碳钢中空结构型材（HSS）。这些形状用于但不限于以下应用:建筑物、桥梁、塔、起重机、标志支架和杆、离岸生产和钻井平台、翻车保护结构（ROPS）、坠落物保护结构（FOPS）和游乐设施。 1.2 该高速钢的焊接尺寸为88英寸。[2235 mm]或更小，规定的标称壁厚为0.148 in。[3.8 mm]或更大且1.000 in。[25.4 mm]或更小。 1.3 以SI单位或英寸表示的值- 磅单位应单独视为标准单位。在文本中，SI单位显示在括号中。每个系统中规定的值可能不完全相等；因此，每个系统应独立使用。合并两个系统的值可能导致不符合标准。除非订单中规定了本规范的“M”名称，否则应采用英寸磅单位。 1.4 本规范文本包含注释和脚注，提供了解释性材料。这些注释和脚注（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 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers cold-formed welded carbon steel hollow structural sections (HSS) for welded or bolted construction. These shapes are utilized in but not limited to the following applications: buildings, bridges, towers, cranes, sign supports and poles, off-shore production and drilling platforms, roll-over protective structures (ROPS), falling object protective structures (FOPS), and amusement rides. 1.2 This HSS is produced in welded sizes with a periphery of 88 in. [2235 mm] or less, and a specified nominal wall thickness of 0.148 in. [3.8 mm] or greater and 1.000 in. [25.4 mm] or less. 1.3 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. 1.4 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. 1.5 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.