1.1 本规范 2 涵盖无缝、直缝焊接和重冷加工焊接奥氏体不锈钢管，用于高温和一般腐蚀性服务。 1.2 等级TP304H、TP309H、TP309HCb、TP310H、TP310HCb、TP316H、TP321H、TP347H和TP348H是等级TP304、TP309Cb、TP309S、TP310Cb、TP310S、TP316、TP321、TP347和TP348的改型，旨在在蠕变和应力断裂性能重要的温度下使用。 1.3 对于需要更大程度测试的管道，提供了可选的补充要求。这些补充要求要求进行额外的测试，并且当需要时，允许按顺序指定这些补充要求中的一个或多个。 1.4 表X1.1 列出了ASME B36中所示的焊接和无缝不锈钢管的标准尺寸。19.这些尺寸也适用于重冷加工管道。允许订购和提供具有其他尺寸的管道，只要此类管道符合本规范的所有其他要求。 1.5 TP321和TP321H等级对于通过无缝工艺制造的标称壁厚大于 3 / 8 在。[9.5毫米]。 1.6 以SI单位或英寸-磅单位表示的值应单独视为标准值。在正文中，国际单位制单位显示在括号中。每个系统中陈述的值可能不完全等同；因此，每个系统应独立使用。合并两个系统的值可能导致不符合标准。除非订单中指定了本规范的“M”名称，否则应适用英寸-磅单位。附注1: 在本标准中，无量纲符号NPS（标称管道尺寸）已取代诸如“标称直径”、“尺寸”和“标称尺寸”等传统术语。 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》中确立的国际公认的标准化原则制定的。

1.1 This specification 2 covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service. 1.2 Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309Cb, TP309S, TP310Cb, TP310S, TP316, TP321, TP347, and TP348, and are intended for service at temperatures where creep and stress rupture properties are important. 1.3 Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and, when desired, it is permitted to specify in the order one or more of these supplementary requirements. 1.4 Table X1.1 lists the standardized dimensions of welded and seamless stainless steel pipe as shown in ASME B36.19. These dimensions are also applicable to heavily cold worked pipe. Pipe having other dimensions is permitted to be ordered and furnished provided such pipe complies with all other requirements of this specification. 1.5 Grades TP321 and TP321H have lower strength requirements for pipe manufactured by the seamless process in nominal wall thicknesses greater than 3 / 8 in. [9.5 mm]. 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. 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.” 1.7 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.