1.1 本规范 2. 包括由中所列奥氏体钢制成的标称壁厚焊接管和重冷加工焊接管 表1 ，具有各种等级，用于锅炉、过热器、热交换器或冷凝器管。 1.2 TP304H、TP309H、TP309 HCb、TP310H、TP310HCb、TPP16H、TP321H、TP347H和TP348H级是对TP304、TP309S、TP309Cb、TP310 S、TP310 Cb、TP316、TP321、TP347和TP348级的修改，适用于过热器和再热器等高温工况。 1.3 通常按照本规范提供的卡套管尺寸和厚度为 1. / 8. 内径为3.2mm至外径为304.8mm。 015至0.320英寸[0.4至8.1毫米]，包括在内，壁厚。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。 1.4 机械性能要求不适用于小于 1. / 8. 内径为英寸[3.2mm]或厚度为0.015英寸[0.4mm]。 1.5 提供了可选的补充要求，当需要一个或多个补充要求时，应在订单中说明每个补充要求。 1.6 以英寸磅单位或国际单位制表示的数值应单独视为标准。在正文中，国际单位制显示在括号中。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。 将两个系统的值合并可能导致不符合标准。英寸磅单位应适用，除非订单中规定了本规范的“M”名称。 1.7 以下安全隐患警告仅适用于本规范补充要求中描述的试验方法。 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 补充要求S7注释S7中给出了具体的警告声明。 1. 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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 nominal-wall-thickness welded tubes and heavily cold worked welded tubes made from the austenitic steels listed in Table 1 , with various grades intended for such use as boiler, superheater, heat exchanger, or condenser tubes. 1.2 Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309S, TP309Cb, TP310S, TP310Cb, TP316, TP321, TP347, and TP348, and are intended for high-temperature service such as for superheaters and reheaters. 1.3 The tubing sizes and thicknesses usually furnished to this specification are 1 / 8 in. [3.2 mm] in inside diameter to 12 in. [304.8 mm] in outside diameter and 0.015 to 0.320 in. [0.4 to 8.1 mm], inclusive, in 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 one or more of these are desired, each 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 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. 1.7 The following safety hazards caveat pertains only to the test method described in the Supplementary Requirements 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. A specific warning statement is given in Supplementary Requirement S7, Note S7.1. 1.8 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.