... steel, 2High-speed steel, High-carbon steel 1.silicon carbide fiber disc, has good flexibility, high Intensity and high ... quantity of ZrO increases.2.Only no harder than Boron carbide and Diamond, friable, its girt is sharp, and ... hard friable materials.4.Please mark in detail(such as max speed, port, special bond and so on), when ... and Nonmetallic material, i.e. single alundum silicon carbide fiber disc