ISO 14104:2017规定了通过化学蚀刻方法检测和分类地面局部过热的程序和要求。 本文件中描述的工艺通常用于地面；然而，它也有助于检测热处理后加工（如硬车削、铣削和断边（去毛刺）过程）产生的表面异常。渗碳或脱碳引起的表面冶金异常也很容易通过该工艺检测到。 不再推荐过去使用的一些方法。为了使用本文件中的方法，拟对规范进行修改。与大多数硬度测试方法相比，这些蚀刻方法对表面硬度的变化更敏感。 ISO 14104:2017适用于齿轮、轴、花键和轴承等钢制零件。不适用于渗氮零件和不锈钢。 注:该工艺虽然有时被称为“硝酸蚀刻”，但并不打算与其他工艺（也称为“硝酸蚀刻”）混淆。 表面回火蚀刻程序在研磨之后和额外的精加工操作（如超精加工、喷丸和珩磨）之前执行。

ISO 14104:2017 specifies procedures and requirements for the detection and classification of localized overheating on ground surfaces by chemical etch methods. The process described in this document is typically used on ground surfaces; however, it is also useful for the detection of surface anomalies that result from post-heat treatment machining such as hard turning, milling and edge breaking (deburring) processes. Surface metallurgical anomalies caused by carburization or decarburization are also readily detectable with this process. Some methods which have been used in the past are no longer recommended. Specifications are intended to be changed to use the methods in this document. These etching methods are more sensitive to changes in surface hardness than most hardness testing methods. ISO 14104:2017 applies to steel parts such as gears, shafts, splines and bearings. It is not applicable to nitrided parts and stainless steels. NOTE This process, although at times called "nital etch", is not intended to be confused with other processes also known as "nital etch". The surface temper etch procedure is performed after grinding and before additional finishing operations such as superfinishing, shot peening and honing.