按国家标准GB1172-74黑色金属硬度与强度换算表,得以下试验公式: HR15N=0.5260HRC+58.72 HR30N=0.9075HRC+22.83 HR45N=1.184HRC-4.75 HRA=0.6000HRC+45.6 *HRD=0.7355HRC+26.78 按“金属机械性能常用数据手册”得如下经验公式 HB_(10/3000)=0.10(HRC)~2+1.95HRC+138 HV=0.255(HRC)~2-6.86HRC+256 在HRC的取值范围内,上述经验公式,几乎无误差的与实验值相符。有了经验公式,对硬度计不全 According to the national standard GB1172-74 black metal hardness and intensity conversion table, the following test formula: HR15N = 0.5260HRC + 58.72 HR30N = 0.9075HRC +22.83 HR45N = 1.184HRC-4.75 HRA = 0.6000HRC +45.6 * HRD = 0.7355HRC +26.78 According to “metal mechanical properties of commonly used data manual ” have the following empirical formula HB_ (10/3000) = 0.10 (HRC) ~ 2 + 1.95HRC +138 HV = 0.255 (HRC) ~ 2-6.86HRC +256 HRC Within the range of values, the empirical formula described above is almost error free consistent with the experimental values. With the empirical formula, the hardness of incomplete