1, black corundum suitable for machining steel, for glass sandblasting, metal forging building floor. In general abrasive corundum hardness lower. However, in the grinding process, the abrasive performance is better crush resistance, suitable for grinding metal with high tensile strength, such as ordinary steel, coarse grinding and re-grinding, in particular suitable for carbon steel, generally steel, malleable cast iron can also be used for grinding and hard bronze. 2, white fused alumina abrasive is another common basic varieties. It is slightly higher than the hardness of corundum. In grinding, the grinding effect of its grinding, cutting force is strong. Corundum for grinding hardness of steel. Such as high-carbon steel, high speed steel, hardened steel, etc., but also easy to produce burns suitable for workpieces, such as knives, thin-walled workpieces such as grinding and fine grinding steel. 3, has a good crystal corundum polygonal cutting edge, high hardness, high toughness, and strong grinding, grinding heat is small, abrasive cutting, long life, can be processed relatively hard and tough steel, such as stainless steel, high vanadium high speed steel, etc., but also particularly fit for deformation, easy to burn the workpiece grinding and large feed double disc grinding. 4, microcrystalline corundum crystals, small size, high strength, good self-sharpening, grinding can be used for depth. In the grinding process, microcrystalline corundum abrasives showing slightly broken state, and good self-sharpening, grinding depth so affordable for a large heavy-duty creep feed grinding. Chromium corundum were pink, so some people call it rosy corundum. Its brittleness moderate, good cutting performance, is suitable for a variety of high-quality finish machining or molding surface grinding. 5, zirconium corundum, high strength, wear resistance, good commensurate, high grinding efficiency, grinding wheel surface clogging, together for the heavy-duty snagging or coarse stainless steel, heat-resistant steel, titanium, high-speed high-vanadium and other materials. 6, silicon carbide is suitable for processing non-ferrous metals and non-metallic materials, black silicon carbide used for internal grindingor cutting strength than the base material, such as cast iron parts, nonferrous metals, abrasive manufacturing, but also for the processing of non-metallic materials such as stone. 7, green silicon carbide used for high hardness and brittleness of the material; such as carbide, optical glass grinding. Chin produces black and green silicon carbide abrasives. Size sand powder, a large smelting furnace, size number from 36 # -1800 #, there are national standard, Japanese standard to 8000 #. The product is high bulk density, grinding ability, high hardness, cutting ability, the average grain size scale, widely suitable ceramic grinding blocks, grinding metal, electronics, jewelry polishing, etc., is the best choice for my friends.