ÖNORM EN ISO 6507-1

This part of ISO 6507 specifies the Vickers hardness test method, for the three different ranges of test force for metallic materials (see Table 1). Table 1 - Ranges of test force Ranges of test force, F N Hardness symbol Designation F W 49,03 W HV 5 Vickers hardness test 1,961 u F < 49,03 HV 0,2 to < HV 5 Low-force Vickers hardness test 0,098 07 u F < 1,961 HV 0,01 to < HV 0,2 Vickers microhardness test The Vickers hardness test is specified in this part of ISO 6507 for lengths of indentation diagonals between 0,020 mm and 1,400 mm. NOTE 1 For indentation diagonals less than 0,020 mm, the increase of the uncertainty has to be considered. NOTE 2 In general, decreasing the test force increases the scatter of results of the measurements. This is particularly true for low-force Vickers hardness tests and Vickers microhardness tests, where the principal limitation will arise in measurement of the diagonals of the indentation. For Vickers microhardness, the accuracy of determination of the mean diagonal length is unlikely to be better than ± 0,001 mm (see Bibliography [2]-[5]). For specific materials and/or products, particular International Standards exist.