1.1 本规范规定了一般工程用焊接铜镍合金管的要求。涵盖以下合金: 2. 铜合金 UNS编号。 2. 金属类型 C70600 90-10铜镍 C70620 90-10铜镍 （为焊接而修改） C71500 70-30铜镍 C71520 70-30铜镍 （为焊接而修改） 1.2 单位- 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。 1.3 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，观察值或计算值应按照实践中的舍入方法进行舍入 E29年 . 所有物 观察值或计算值的舍入单位 化学成分 指定极限数字最后右侧位置的最近单位 抗拉强度 屈服强度 最接近的ksi（最接近的MPa小于等于10 ksi，包括最接近的5 MPa大于10 ksi） 伸长率 最近的1 %

1.1 This specification establishes the requirements for welded copper-nickel alloy pipe for general engineering purposes. The following alloys are covered: 2 Copper Alloy UNS No. 2 Type of Metal C70600 90-10 copper-nickel C70620 90-10 copper-nickel (Modified for Welding) C71500 70-30 copper-nickel C71520 70-30 copper-nickel (Modified for Welding) 1.2 Units— 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. 1.3 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 purposes of determining compliance with the specified limits for requirements of the properties listed in the following table, and 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 place of figures of the specified limit Tensile strength Yield strength nearest ksi (nearest MPa up to 10 ksi, incl, nearest 5 MPa over 10 ksi) Elongation nearest 1 %