1.1 本规范涵盖了用于液压系统和其他类似应用中的标称壁厚无缝冷拔碳钢管，其中成型操作需要紧密半径弯曲和扩口。 1.2 通常根据本规范提供的管道尺寸和厚度为 1. / 8. 至3 1. / 2. 在里面外径[3.2至88.9 mm]和0.035至0.134 in。[0.9至3.4 mm]，包括标称壁厚。可以提供具有其他尺寸的管道，前提是此类管道符合本规范的所有其他要求。 1.3 机械性能要求不适用于小于 1. / 8. 在里面内径[3.2 mm]或0.015 in。厚度为[0.4 mm]。 1.4 提供了可选的补充要求，如果需要，应在订单中说明。 1.5 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。 1.6 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 nominal wall thickness, seamless, cold-drawn carbon steel tubing intended for use in hydraulic systems and in other similar applications where forming operations require tight radius bending and flaring. 1.2 Tubing sizes and thicknesses usually furnished to this specification are 1 / 8 to 3 1 / 2 in. [3.2 to 88.9 mm] in outside diameter and 0.035 to 0.134 in. [0.9 to 3.4 mm] inclusive, in nominal wall thickness. Tubing having other dimensions may be furnished, provided such tubing complies with all other requirements of this specification. 1.3 Mechanical property requirements do not apply to tubing smaller than 1 / 8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness. 1.4 Optional supplementary requirements are provided and, when desired, shall be so stated in the order. 1.5 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. 1.6 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.