You can also use the hardness conversion calculator for metals (ASTM E140-97). The Vickers Hardness test (ISO 6507) is used to characterize hardness of various solid materials (metals, ceramics, etc.). A diamond in the form of a square-based pyramid satisfied these conditions. Vickers Hardness Test (HV) The Vickers Hardness Test uses a diamond indenter in the form of a right pyramid with a square base and an angle of 136 degress between opposite faces. CONVERSION CHART OF VICKERS HARDNESS (HV) TO ROCKWELL C (HRC) Vickers Hardness Number HV: Rockwell C Scale Hardness HRC: Vickers Hardness Number HV: Rockwell C Scale Hardness HRC: Vickers Hardness Number HV: Rockwell C Scale Hardness HRC: Vickers Hardness Number HV: Rockwell C Scale Hardness HRC: 900 890 880 870 860 850 840 830 820 810 800 790 780 770 760 750 740 730: … There are multiple testing methods for hardness measurement, such as Rockwell, Brinell, and Vickers, which resulting in different expressions in hardness. A can be determined by the formula. the full load is applied for 10 to 15 seconds. Accordingly, loads of various magnitudes are applied to a flat surface, depending on the hardness of the material to be measured. It was decided that the indenter shape should be capable of producing geometrically similar impressions, irrespective of size; the impression should have well-defined points of measurement; and the indenter should have high resistance to self-deformation. As two tangents to the circle at the ends of a chord 3d/8 long intersect at 136°, it was decided to use this as the included angle between plane faces of the indenter tip. HV = Vickers hardness When the mean diagonal of the indentation has been determined the Vickers hardness may be calculated from the formula, but is more convenient to use conversion tables. The HV number is then determined by the ratio F/A, where F is the force applied to the diamond in kilograms-force and A is the surface area of the resulting indentation in square millimeters. It had been established that the ideal size of a Brinell impression was ​ ⁄8 of the ball diameter. This gives an angle from each face normal to the horizontal plane normal of 22° on each side. Here CNClathing.com provide the hardness conversion chart PDF version for checking and download. A diamond pyramid is pressed against the solid with a certain normal load and the hardness is calculated based on the imprint left on the surface. Additionally, introducing difference between Rockwell and … The angle was varied experimentally and it was found that the hardness value obtained on a homogeneous piece of material remained constant, irrespective of load. The Vickers hardness should be reported like 800 HV/10, which means a Vickers hardness of 800, was obtained using a 10 kgf force. The indenter is subjected to a load of 1 to 100 kgf.