Cubic boron nitride (CBN) is a hardness second only to diamond superhard material, it not only has many excellent properties of diamond, but also has higher thermal stability and chemical inertia of iron group metals and their alloys, its hardness and chemical properties make CBN especially suitable for grinding iron alloys and other aerospace materials, the use of cubic boron nitride is a major contribution to metal processing. Leading to revolutionary changes in grinding, is the second leap in grinding technology. Tianyou series CBN has been widely used in aerospace, automotive, military, wind power, metallurgical electrical appliances and other high-tech fields.