1.1 本试验方法包括用于电触点的金属材料硬度的测定。包括洛氏硬度、洛氏表面硬度、布氏硬度和显微压痕硬度测试，以及这些测试的限制和使用信息。 1.2 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 本标准并不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，制定适当的安全、健康和环境实践，并在使用前确定监管限制的适用性。 1.4 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。 ====意义和用途====== 3.1 当试样足够厚（相对于压头载荷）以确保结果不受铁砧表面金属流动的影响时，洛氏硬度和洛氏表面试验是有用的。在实心件上，下表面上的金属流动可以通过凸起或标记来检测。 在接触材料连接到不同材料背衬上的复合件上，对实心件施加的厚度限制应适用于此类复合件的接触材料部分。 注1: 作为一个信息问题，可以说，对细银的测试表明，在洛氏15T硬度为27的退火样品上，读数不受厚度的影响 1. / 16 英寸（1.6毫米）或以上。关于厚度 1. / 32 英寸（0.8毫米）洛氏15T刻度72及以上的读数不受影响。 3.2 当材料中的金属相太大以至于压痕不能代表准确的平均硬度时，显微压痕硬度测试的意义值得怀疑。 烧结接触材料通常含有硬度与基体硬度相差很大的偏析，并可能破坏显微压痕硬度读数的有效性。 3.3 重要意义和用途的其他方面应如所使用的特定ASTM试验方法所述，如第节所列 2. .

1.1 This test method covers the determination of the hardness of metallic materials used for electrical contacts. Rockwell, Rockwell superficial, Brinell, and microindentation hardness tests are included, along with information on the limitations and use of these tests. 1.2 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 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 will 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. 1.4 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 ====== 3.1 The Rockwell hardness and Rockwell superficial tests are useful when the test specimens are sufficiently thick (in relation to the indentor load) to ensure that the results are not affected by the flow of metal on the surface of the anvil. On a solid piece the flow of metal on the under surface may be detected by a bulge or marking. On composite pieces where the contact materials are attached to backings of a different material, the thickness limitations imposed for a solid piece shall apply to the contact material portion of such composite pieces. Note 1: As a matter of information, it may be stated that tests on fine silver showed that on annealed samples having a Rockwell 15T hardness of 27, the readings were not affected on thicknesses 1 / 16 in. (1.6 mm) or over. On thicknesses of 1 / 32 in. (0.8 mm) Rockwell 15T scale readings of 72 and higher were not affected. 3.2 The microindentation hardness test is of questionable significance when the metallic phases in a material are so large that the indentation does not represent an accurate average hardness. Sintered contact materials usually contain segregates differing greatly in hardness from the matrix hardness and may destroy the validity of microindentation hardness readings. 3.3 Other aspects of significance and use shall be as described in the particular ASTM test method used, as listed in Section 2 .