1.1 本试验方法包括通过应用超声波接触阻抗法（UCI法）测定比较硬度值。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.2.1 例外情况- 信息英寸磅单位在中提供 注1 ksi用于 12.1 . 1.3 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。 1.4 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====== 4.1 材料的硬度是一个定义的量，具有许多刻度，并取决于测试的执行方式。为了避免创建涉及新硬度标度的新方法，UCI方法将转换为常见硬度值，例如HV、HRC等。 4.2 UCI硬度测试是一种表面测定，仅测量接触表面的硬度状况。在特定位置生成的结果不代表任何其他表面位置的零件，也不产生有关地下位置材料的信息。 4.3 UCI硬度测试可用于不同位置的大型或小型部件。它可以用于在难以接近的位置进行硬度测量，例如齿轮的齿面或齿根。

1.1 This test method covers the determination of comparative hardness values by applying the Ultrasonic Contact Impedance Method (UCI Method). 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 Exception— Informational inch-pound units are provided in Note 1 and ksi is used in 12.1 . 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 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 ====== 4.1 The hardness of a material is a defined quantity having many scales and being dependent on the way the test is performed. In order to avoid the creation of a new method involving a new hardness scale, the UCI method converts into common hardness values, for example, HV, HRC, etc. 4.2 The UCI hardness test is a superficial determination, only measuring the hardness condition of the surface contacted. The results generated at a specific location do not represent the part at any other surface location and yield no information about the material at subsurface locations. 4.3 The UCI hardness test may be used on large or small components at various locations. It can be used to make hardness measurements on positions difficult to access, such as tooth flanks or roots of gears.