1.1 本规范规定了高达3的铜和各种铜合金焊接管的要求 1. / 8. 在里面包括直径，用于表面冷凝器、蒸发器、热交换器和一般工程应用。涉及以下铜或铜合金: 2. 铜或 铜合金UNS号。 2. 以前使用过 任命 金属类型 C10800 A. . 无氧、低磷 C12200 A. . DHP磷化，高 残余磷 C19400元 . 铜铁合金 C23000 . 红黄铜 C44300 . 海军部军火库 C44400 . 反垄断海军部 C44500 . 磷化海军部 C68700 . 砷铝黄铜 C70400 . 95-5铜镍 C70600 . 90-10铜镍 C70620 . 90-10铜镍（改性 用于焊接） C71000 . 80-20铜镍 C71500 . 70-30铜镍 C71520 . 70-30铜镍（改性 用于焊接） C71640 . 铜镍铁锰 C72200 . . 1.2 以英寸-磅或国际单位制表示的数值应单独视为标准值。在本文中，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。 1.3 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。 ( 警告- 许多监管机构已将汞指定为一种危险物质，可导致严重的医疗问题。汞或其蒸汽已被证明对健康有害，并对材料具有腐蚀性。处理汞和含汞产品时要小心。有关更多信息，请参阅适用的产品安全数据表（SDS）。当地或国家法律禁止销售汞或含汞产品，或两者兼有。用户必须确定其所在地销售的合法性。 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。 ====意义和用途====== 20.1 为了确定是否符合下表所列特性要求的规定限值，应按照实践中的舍入方法对观察值或计算值进行舍入 E29年 . 所有物 观察到的或 计算值 化学成分 最后一个右手位置的最近单位 数字的数量 抗拉强度和屈服强度 最近的ksi（最近的5 MPa） 粒径:小于等于0.055 mm， 超过0.055毫米 0.005 mm的最近倍数 最接近0.010 mm 扩展: 最近的1 %

1.1 This specification establishes the requirements for welded tube of copper and various copper alloys up to 3 1 / 8 in., inclusive, in diameter, for use in surface condensers, evaporators, heat exchangers, and general engineering applications. The following coppers or copper alloys are involved: 2 Copper or Copper Alloy UNS No. 2 Previously Used Designation Type of Metal C10800 A . oxygen-free, low phosphorus C12200 A . DHP phosphorized, high residual phosphorus C19400 . copper-iron alloy C23000 . red brass C44300 . arsenical admiralty C44400 . antimonial admiralty C44500 . phosphorized admiralty C68700 . arsenical aluminum brass C70400 . 95-5 copper-nickel C70600 . 90-10 copper-nickel C70620 . 90-10 copper-nickel (Modified for Welding) C71000 . 80-20 copper-nickel C71500 . 70-30 copper-nickel C71520 . 70-30 copper-nickel (Modified for Welding) C71640 . copper-nickel-iron-manganese C72200 . . 1.2 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, 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. 1.3 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. ( Warning— Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location. 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. ====== Significance And Use ====== 20.1 For purposes of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29 . Property Rounded Unit for Observed or Calculated Value Chemical composition nearest unit in the last righthand place of figures Tensile strength and yield strength nearest ksi (Nearest 5 MPa) Grain size: Up to 0.055 mm, incl, Over 0.055 mm nearest multiple of 0.005 mm to the nearst 0.010 mm Expansion: Nearest 1 %