... ZrO increases.2.Only no harder than Boron carbide and Diamond, friable, its girt is sharp, and Thermal conductivity3. Suitable for ... -speed steel, High-carbon steel,Chromium corundumPAPink,rose-red Sharp cutting, good edges holdout, durableSuitable for form grinding, knives, Measuring instrumentGreen ... strength metallic and Nonmetallic material, i.e. single alundum abrasive cutting tool