1.1 本规范涵盖焊接奥氏体、铁素体和奥氏体-铁素体双相不锈钢机械管，用于装饰、结构、排气和其他需要外观、机械性能或耐腐蚀性的应用。所涵盖的年级列于 表1 . 1.2 本规范涵盖尺寸为16英寸的焊接或冷轧机械管。（406.4 mm）外径，壁厚0.020 in。（0.51 mm）及以上。 1.3 管道应按买方规定的以下形状之一提供:圆形、方形、矩形或特殊形状。 1.4 提供了可选的补充要求，必要时应在订单中说明。 1.5 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。 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 covers welded austenitic, ferritic, and austenitic-ferritic duplex stainless steel mechanical tubing intended for use in ornamental, structural, exhaust, and other applications where appearance, mechanical properties, or corrosion resistance is needed. The grades covered are listed in Table 1 . 1.2 This specification covers as-welded or cold-reduced mechanical tubing in sizes to 16 in. (406.4 mm) outside dimension, and in wall thicknesses 0.020 in. (0.51 mm) and over. 1.3 Tubes shall be furnished in one of the following shapes as specified by the purchaser: round, square, rectangular, or special. 1.4 Supplementary requirements of an optional nature are provided and when desired shall be so stated in the order. 1.5 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. 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.