1.1 本规范 2. 包括最小壁厚、由碳钢和碳锰钢制成的电阻焊接管，用于锅炉管、锅炉烟道、过热器烟道和安全端。 1.2 本规范涵盖了具有不同化学要求的A级、C级和D级（第 6. 和 表1 )，不同的拉伸要求（第 9 和 表2 )以及不同的压碎和机械试验要求（第 10 和 11 ). 注1: C级和D级管子不适用于锻焊的安全端接。 1.3 通常根据本规范提供的管道尺寸和厚度为 1. / 2. 至5英寸。外径[12.7至127 mm]和0.035至0.360 in。[0.9至9.1 mm]，包括最小壁厚。 可提供其他尺寸的管子，前提是此类管子符合本规范的所有其他要求。 1.4 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]。 1.5 提供了可选的补充要求，如果需要，应在订单中说明。 1.6 以英寸-磅单位或国际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不是精确的等价物；因此，每个系统必须相互独立使用。合并两个系统的值可能会导致不符合规范。 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。 1.7 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 2 covers minimum-wall-thickness, electric-resistance-welded tubes made of carbon steel and carbon-manganese steel intended for use as boiler tubes, boiler flues, superheater flues, and safe ends. 1.2 This specification covers Grades A, C, and D with differing chemical requirements (Section 6 and Table 1 ), differing tensile requirements (Section 9 and Table 2 ), and differing crush and mechanical testing requirements (Sections 10 and 11 ). Note 1: Grades C and D tubes are not suitable for safe-ending for forge welding. 1.3 The tubing sizes and thicknesses usually furnished to this specification are 1 / 2 to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.360 in. [0.9 to 9.1 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification. 1.4 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. 1.5 Optional supplementary requirements are provided and when desired, shall be so stated in the order. 1.6 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order. 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.