On a New Measuring Method of Rockwell Hardness

Abstract

The author has proposed a new measuring method of Rockwell hardness which is measured by an indenter with a conical angle different from 120° or by a minor load larger than 10 kg. The conversion formulae between this hardness and Vickers hardness Hv and the equations of errors were induced theoretically and checked experimentally. This new hardness has many merits. For example, using the conical angle larger than 120°, the hardness range of 60<Hv<1000 can be expressed by a single indenter continuously and thin sheets are measured without employing any special superficial tester. The conical angle smaller than 120° is effective to raise the sensitiveness of measurement for very hard specimens. For rough surfaces, we can get reliable results which have small scattering ranges by larger minor load.