1.1 本规范 2. 制定了冷凝器、蒸发器和热交换器U形弯管的要求，这些U形弯管由无缝铜管和铜合金管制成。 1.2 单位- 以国际单位制或英寸-磅单位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 本规范适用于中的产品2。直径小于等于50 mm。 1.4 产品应由订购信息中规定的以下铜或铜合金之一制成: 铜或 铜合金 UNS编号。 以前使用过 任命 金属类型 C10200 的 A. 无氧，无残留脱氧剂 C10300 . 无氧、超低磷 C10800 . 无氧、低磷 C12000 DLP A. 磷化，低残留磷 C12200 DHP公司 A. 磷化，高残留磷 C14200 DPA A. 磷化、砷 C19200 . 磷化，1 % 铁 C23000 . 红黄铜 C44300 B类 海军金属 C44400 C类 海军金属 C44500 D型 海军金属 C60800 . 铝青铜 C68700 B类 铝黄铜 C70400 . 95-5铜镍 C70600 . 90-10铜镍 C70620 . 90-10铜镍- （为焊接而修改） C71000 . 80-20铜镍 C71500 . 70-30铜镍 C71520 . 70-30铜镍- （为焊接而修改） C72200 . 铜镍合金 （A） 分类中列出的名称 B224页 . 1.5 以下安全危险警告仅适用于本规范中所述的试验方法。 1.5.1 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应小心。有关更多信息，请参阅适用的产品安全数据表（SDS）。用户应意识到，法律可能禁止向您所在的州或国家销售汞和/或含汞产品。） 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。 ====意义和用途====== 18.1 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 最近的单位 右侧有效 用于表达的数字 极限值 抗拉强度 最近的ksi[最近的5 MPa] 伸长率 最近的1 % 膨胀 最近的1 % 粒度 0.005 mm的最近倍数

1.1 This specification 2 establishes the requirements for condenser, evaporator, and heat exchanger U-bend tubes that are manufactured from seamless copper and copper alloy tube. 1.2 Units— The values stated in either SI units or inch-pound 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 specification is applicable to product 2 in. [50 mm] or less, inclusive, in diameter. 1.4 The product shall be produced from one of the following coppers or copper alloys, as specified in the ordering information: Copper or Copper Alloy UNS No. Previously Used Designation Type of Metal C10200 OF A oxygen-free without residual deoxidants C10300 . oxygen-free, extra low phosphorus C10800 . oxygen-free, low phosphorus C12000 DLP A phosphorized, low residual phosphorus C12200 DHP A phosphorized, high residual phosphorus C14200 DPA A phosphorized, arsenical C19200 . phosphorized, 1 % iron C23000 . red brass C44300 Type B admiralty metal C44400 Type C admiralty metal C44500 Type D admiralty metal C60800 . aluminum bronze C68700 Type B 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) C72200 . copper-nickel (A) Designations listed in Classification B224 . 1.5 The following safety hazard caveat pertains only to the test methods described in this specification. 1.5.1 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. Caution should be taken when handling mercury and mercury containing products. See the applicable product Safety Data Sheet (SDS) for additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law.) 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. ====== Significance And Use ====== 18.1 For purpose 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 right-hand significant digit used in expressing the limiting value Tensile strength nearest ksi [nearest 5 MPa] Elongation nearest 1 % Expansion nearest 1 % Grain size nearest multiple of 0.005 mm