指定显微照相方法和显微硬度测量方法。适用于厚度小于或等于0.3 mm的薄表面层，例如通过机械（喷丸、喷丸等）、热（火焰或感应淬火等）或热化学（碳氮共渗、渗碳和硬化等）处理获得。不适用于与基体金属不连续的薄表面层。

Specifies the micrographic method and the microhardness measurement method. Applies to thin surface layers, with thicknesses of less than or equal to 0.3 mm, obtained, for example, by mechanical (shot blasting, shot peening, etc), thermal (flame or induction hardening, etc) or thermochemical (carbonitriding, carburizing and hardening, etc) treatment. It is not applicable to thin surface layer which are not continuous with the basis metal.