1.1 本规范描述了无缝和焊接铁素体、奥氏体和双相合金钢管，其外表面或内表面或两者均已通过冷成型工艺进行修改，以产生整体增强表面，以改善传热。这些管子用于表面冷凝器、蒸发器、热交换器和类似的传热设备，其未连接端直径小于等于1英寸。（25.4毫米）。不包括锅炉管。 1.2 以英寸-磅为单位的数值应视为标准值。括号中给出的值仅供参考。 1.3 以下预防说明仅适用于试验方法部分，第 12 ，本规范: 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。 1.4 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 describes seamless and welded ferritic, austenitic and duplex alloy steel tubing on which the external or internal surface, or both, has been modified by a cold forming process to produce an integral enhanced surface for improved heat transfer. The tubes are used in surface condensers, evaporators, heat exchangers and similar heat transfer apparatus in unfinned end diameters up to and including 1 in. (25.4 mm). Boiler tubes are excluded. 1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 The following precautionary statement pertains to the test method portion only, Section 12 , of this specification: 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. 1.4 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.