1.1 本规范 2. 包括主要用于在大气和较低温度下使用的无缝碳钢管，NPS 1. / 8. 至26[DN 6至650]，标称（平均）壁厚见ANSI B36.10。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。根据本规范订购的管道应适用于焊接、弯曲、翻边和类似成型操作。 1.2 该产品有两个等级( 表1和 2. ). 1.3 产品可以是热加工或冷拔制造（参见 5.1.4 和 5.1.5 ). 1.4 单位- 本规范以英寸-磅单位和国际单位制表示；但是，除非采购订单或合同规定了适用的M规格名称（国际单位制），否则英寸- 磅单位应适用。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。以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 注1: 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。 ” 1.5 以下危险警告适用于试验方法部分第节 16 只有 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。 1.6 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 2 covers seamless carbon steel pipe intended primarily for service at atmospheric and lower temperatures, NPS 1 / 8 to 26 [DN 6 to 650] inclusive, with nominal (average) wall thickness as given in ANSI B36.10. Pipe having other dimensions may be furnished, provided such pipe complies with all other requirements of this specification. Pipe ordered to this specification shall be suitable both for welding, and for bending, flanging, and similar forming operations. 1.2 The product is available in two grades ( Tables 1 and 2 ). 1.3 Product may be either of hot finished or cold drawn manufacture (see 5.1.4 and 5.1.5 ). 1.4 Units— This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M specification designation (SI units), the inch-pound units shall apply. 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Note 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.” 1.5 The following hazard caveat applies to the test methods portion, Section 16 , only. 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. 1.6 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.