前言本标准规定的是测定氮化钢硬化层表面硬度的方法。因为硬化层的厚度和断面硬度梯度是根据氮化条件和钢种而变化,所以根据硬度试验方法应考虑如下情况。(Ⅰ) 硬度试验负荷相对于硬化层厚度来说小,造成的塑性变形所影响到的范围 Preface This standard specifies the method of determining the surface hardness of nitrided steel hardened layer. Because the thickness of the hardened layer and the cross-sectional hardness gradient vary depending on the nitriding conditions and the type of steel, the following cases should be considered according to the hardness test method. (Ⅰ) hardness test load relative to the thickness of the hardened layer is small, the plastic deformation caused by the impact of the scope