1.1 本规范涵盖直径大于等于NPS 16的电熔（电弧焊）直缝或螺旋缝钢管（内部或外部由买方指定），壁厚高达 3. / 4. 在里面[19毫米]，包括在内。可提供其他尺寸的管道，前提是此类管道符合本规范的所有其他要求。根据订购的ASTM规范（第节），管道可提供不同等级 4. ). 注1: 许多服务的可接受性可能由规范或标准控制，例如美国国家标准协会和美国机械工程师学会发布的规范或标准。 注2: 对于本规范中未具体涵盖的测试方法，可参考测试方法和定义 A370型 ，特别参考关于钢管产品的附录A2。 注3: ANSI B中包含标准化管道尺寸的综合列表 36 10 1.2 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。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。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。 注4: 本标准用无量纲指示符NPS（标称管道尺寸）代替了“标称直径”、“尺寸”和“标称尺寸”等传统术语 1.3 以下警告特别适用于第 5. 符合本规范的要求。 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 covers electric-fusion (arc)-welded straight seam or spiral seam steel pipe NPS 16 and over in diameter (inside or outside as specified by purchaser), with wall thicknesses up to 3 / 4 in. [19 mm], inclusive. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification. The pipe is available in various grades based on the ASTM specification ordered (Section 4 ). Note 1: Acceptability for many services may be controlled by codes or standards such as those published by the American National Standards Institute and American Society of Mechanical Engineers. Note 2: For testing methods not specifically covered in this specification, reference can be made to Test Methods and Definitions A370 , with particular reference to Annex A2 on Steel Tubular Products. Note 3: A comprehensive listing of standardized pipe dimensions is contained in ANSI B 36.10. 1.2 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 diameter, lengths, and tensile properties. Soft conversion applies to other SI measurements. Note 4: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.” 1.3 The following caveat pertains specifically to Section 5 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.