1.1 本规范涵盖了板材、带材、线材和棒材形式的锻造贵金属电接触合金产品的一般要求。除非采购订单或单独规范中另有规定，否则这些一般要求应适用于ASTM发布的适用产品规范中规定的锻造电接触材料。 1.2 如有冲突，应以采购订单、单独规范和本通用规范中的要求为准。 1.3 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。 1.4 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熟悉所有危险，包括制造商提供的本产品/材料的适当安全数据表（SDS）中确定的危险，建立适当的安全、健康和环境实践，并在使用前确定监管限制的适用性。 1.5 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====== 11.1 为了确定是否符合下表所列特性要求的规定限值，应按照惯例对观察值或计算值进行四舍五入 E29年 . 所有物 单元 圆形单位 用于观察或 计算值 化学成分 百分比 硬度 努氏硬度（100-g负载，除非另有规定- wise指定） 维氏硬度（规定载荷） 罗克韦尔（所有刻度，指定哪一个） 洛氏表面（所有刻度， 指定） 最后右边最近的单位 图形的手位置 指定限制 电阻率 μΩ·cm 抗拉强度 psi（MPa） 最接近1000 psi（最接近10 MPa） 屈服强度 psi（MPa） 最接近1000 psi（最接近 10 MPa） 伸长率 低于5 % 百分比 0.5的最近倍数 % 5. % 和以上 百分比 最近的1 % 粒度 0.055毫米以下 包括。 毫米 最接近的倍数 0.005 毫米 大于0.055至0.160，mm，包括。 毫米 最接近0.01毫米

1.1 This specification covers general requirements common to wrought precious metal electrical contact alloy products in the form of sheet, strip, wire, and rod. Unless otherwise specified in the purchase order or in an individual specification, these general requirements shall apply to wrought electrical contact materials where indicated in the applicable product specifications issued by ASTM. 1.2 In case of conflict, the requirements on the purchase order, the individual specification, and this general specification shall prevail in the sequence named. 1.3 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. 1.4 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 become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use. 1.5 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 ====== 11.1 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 Practice E29 . Property Unit Rounded Unit for Observed or Calculated Value Chemical composition percent Hardness Knoop (100-g load unless other- wise specified) Vicker (specify load) Rockwell (all scales, specify which) Rockwell superficial (all scales, specify which) nearest unit on the last right hand place of figure of specified limit Resistivity μΩ·cm Tensile strength psi (MPa) nearest 1000 psi (nearest 10 MPa) Yield Strength psi (MPa) nearest 1000 psi (nearest 10 MPa) Elongation Below 5 % percent nearest multiple of 0.5 % 5 % and over percent nearest 1 % Grain size Up to 0.055 mm  incl. mm nearest multiple of  0.005 mm Over 0.055 to 0.160, mm, incl. mm nearest 0.01 mm