1.1 本规范涵盖电子应用的镀锡铜包钢丝。 1.2 镀锡铜包钢丝包括以下四类: 1.2.1 T30HS级-- 标称30 % 导电性，硬拉， 1.2.2 T30A级-- 标称30 % 导电性，退火， 1.2.3 T40HS级-- 标称40 % 导电性，硬拉，和 1.2.4 T40A级-- 标称40 % 导电性，退火。 1.3 以英寸-磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.3.1 例外-- 电阻率和体积的SI值应视为标准值。 1.4 以下安全隐患警告仅适用于试验方法部分，第节 6. ，本规范: 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的使用者有责任建立适当的安全、健康和环境 实践，并在使用前确定监管限制的适用性。 ( 警告-- 选择溶剂清洁剂时应考虑毒性和易燃性。） 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers tin-coated copper-clad steel wire for electronic application. 1.2 Four classes of tin-coated copper-clad steel wire are covered as follows: 1.2.1 Class T30HS— Nominal 30 % conductivity, hard-drawn, 1.2.2 Class T30A— Nominal 30 % conductivity, annealed, 1.2.3 Class T40HS— Nominal 40 % conductivity, hard-drawn, and 1.2.4 Class T40A— Nominal 40 % conductivity, annealed. 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. 1.3.1 Exception— The SI values for resistivity and volume are to be regarded as standard. 1.4 The following safety hazards caveat pertains only to the test method portion, Section 6 , of this specification: 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— Consideration should be given to toxicity and flammability when selecting solvent cleaners.) 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.