Black silicon carbide is made of quartz sand and petroleum coke, which is smelted by resistance furnace at high temperature. Its hardness is between corundum and diamond, and its mechanical strength is higher than corundum. It is suitable for processing metal and non-metal materials with low tensile strength, such as grey cast iron, non-ferrous metal, stone, leather, rubber, etc., also widely used in refractory materials, metallurgical additives.