Profile Vickers hardness test Penetrating body: Square diamond pyramid :Test force F N ... 981 N (HV 5 ... HV 100) 49 :Measured value Diagonals of the square impression d Hardness value: F 0,189 F HV= A Indication of the hardness value, e.g.: 347 HV 10: hardness value 347 HV Vickers hardness 10 test force code = F/N * 0.102, corresponds to the indication of the test load in kp (outdated unit) or kgf (kg force); Conditions: Vickers hardness test is suitable for all materials The result of the hardness test is independent of the selected test force The area to be checked must be free of impurities the smaller the test force, the better the surface quality must be (as little roughness as possible) Minimum thickness of the samples: 1.5*d (see table on page 2) Test impressions are relatively small even with large test forces (Impression diagonals <1 mm) Test impressions must be able to be measured with sufficient accuracy, therefore: d> 0.02 mm! Minimum distance of impressions: 3*d for steel and copper, 6*d for light metals Profile Rockwell hardness test Penetrating body: diamond cone or carbide ball Test Force: 588.4 N... 1471 N Measured value: Depth of the impression h under the influence of the pre-force Hardness value: for processes with diamond cone as penetrating body h HR-100- 0,002 mm 0.002 mm for processes with diamond cone as penetrating bodies HRC: Diamond cone, F0-98.07 N, F= 1.471 kN Due to the large testing force, the HRC test is only for medium-hard and hard Materials (e.g. hardened steels) suitable. Indication of the hardness value: e.g. 62.5 HRC Profile Brinell hardness test DIN EN ISO 6506-1 Penetrating body: Carbide ball (Formerly: hardened steel) Test parameters: Ball diameter D: 1mm/2.5 mm/5 mm/10 mm Testing force F: 24.5 N... 29.4 KN (Depending on the material and D) Level of stress: 0.102*F/D2, must be constant with comparable samples, Soft materials are used under low stress Tested, harder materials with a high degree of stress Indication of the hardness value, e.g. 195 HBW 5/250: 195 hardness value HBW Brinell hardness, carbide ball 5 ball diameters in mm 250 test force code F/N * 0.102, corresponds to the indication of the Test load in kp (outdated unit) or kgf (kg force), 250 kp = 2.45 kN Measured value: Impression diameter d Hardness value: F 0,204 F HBW=ARD(D-D-) Conditions: suitable for soft to medium hard materials (up to 650 HB) Impression diameter d to 6 mm, if ball diameter D = 10 mm d must not be too large or too small in relation to the ball diameter and must Between 0.24*D and 0.6*D Minimum distance of impressions: 3*d, Minimum thickness of the samples: 8* penetration depth