1.1 本规范涵盖了用作机械卡套管的电阻焊接碳和合金钢管。 1.2 本规范涵盖由热轧或冷轧钢制成的机械卡套管。 1.3 本规范涵盖圆形、方形、矩形和特殊形状的卡套管。 类型 尺寸范围 （圆形卡套管） 电阻焊接卡套管 来自热轧钢 外径来自 1. / 2. 至15英寸。 [12.7至380毫米] 壁厚0.065至0.650英寸。 [1.65至16.5毫米] 电阻焊接卡套管 来自冷轧钢 外径来自 3. / 8. 至12英寸。 [9.5至300毫米] 壁厚从0.022到0.134英寸。 [0.56至3.40毫米] 1.3.1 可以订购不确定的壁厚。在这些情况下，表4、6、7、8、9、10、11、12、16和17中更严格的公差应适用。当订购的尺寸在允许范围内时，应满足规范的所有其他要求。 1.4 本规范涵盖各种等级的机械卡套管（见第节 6. )，类型（请参阅 13.1 )，和热条件( 13.1 ). 1.5 提供了可选的补充要求，必要时应在订单中说明。 1.6 以国际单位制或英寸磅单位表示的数值应单独视为标准。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是完全相等的；因此，每个系统应独立于其他系统使用。将两个系统的值合并可能导致不符合标准。英寸磅单位应适用，除非订单中规定了本规范的“M”名称。在本规范中，硬转换或合理转换适用于直径、长度和拉伸性能。 软转换适用于其他SI测量。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers electric-resistance-welded carbon and alloy steel tubing for use as mechanical tubing. 1.2 This specification covers mechanical tubing made from hot- or cold-rolled steel. 1.3 This specification covers round, square, rectangular, and special shape tubing. Type Size Range (Round Tubing) Electric-Resistance-Welded Tubing  from Hot-Rolled Steel outside diameter from 1 / 2 to 15 in. [12.7 to 380 mm] wall from 0.065 to 0.650 in. [1.65 to 16.5 mm] Electric-Resistance-Welded Tubing  from Cold-Rolled Steel outside diameter from 3 / 8 to 12 in. [9.5 to 300 mm] wall from 0.022 to 0.134 in. [0.56 to 3.40 mm] 1.3.1 Indeterminate wall thicknesses may be ordered. In those cases the more stringent tolerances of Tables 4, 6, 7, 8, 9, 10, 11, 12, 16, and 17 shall apply. When sizes within the allowable ranges are ordered all other requirements of the specification shall be met. 1.4 This specification covers mechanical tubing in various Grades (see Section 6 ), Types (see 13.1 ), and Thermal Conditions ( 13.1 ). 1.5 Optional supplementary requirements are provided and when desired, shall be so stated in the order. 1.6 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. In this specification hard or rationalized conversions apply to diameters, lengths and tensile properties. Soft conversion applies to other SI measurements. 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.