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本标准用以规定金属及其合金表面洛氏硬度(HRN、HRT标尺)的测定方法。一、一般规则 1.金属表面洛氏硬度的测定系在先后两次施加负荷(初负荷P_0及总负荷P)的作用下,将标准型压头(金刚石元锥或钢球)压入试件表面来进行,总负荷P为初负荷P_0及主负荷P_1之和,即P=P_0+P_1。 2.表面洛氏硬度值是用加总负荷P并卸除主负荷P_1后,在初负荷P_0继续作用下,由于主负荷P_1所引起的残余压入深度值e来计算。数值e系以规定单位0.001毫米表示,因此当压
This standard specifies the determination of Rockwell hardness (HRN, HRT scale) on the surface of metals and their alloys. First, the general rules 1. The determination of the Rockwell hardness of the metal surface has been imposed twice the load (initial load P_0 and total load P) under the action of the standard pressure head (diamond cone or steel ball) into the specimen Surface, the total load P is the sum of the initial load P_0 and the main load P_1, that is, P = P_0 + P_1. 2. The surface Rockwell hardness value is calculated by adding the total load P and removing the main load P_1 and continuing the action of the initial load P_0 due to the residual pressing depth value e caused by the main load P_1. The value of e is 0.001 millimeters in the specified unit, so when pressed