... for the work pieces made of materials Chilled steel, 2.High-speed steel, High-carbon steel 1.abrasive grinding ... quantity of ZrO increases.2.Only no harder than Boron carbide and Diamond, friable, its girt is sharp, and Thermal conductivity3. Suitable ... crisper, less flexibility.Suitable for process weak Tensile strength metallic and Nonmetallic material, i.e. single alundum abrasive cutting tool