The selection of material is the world excellent anti-wear material -- super high chromium cast iron. Cast iron by controlling solidification technology, according with the modifier modification, grain refinement, improving toughness, improving the shape and distribution of carbides, the carbide growth direction is perpendicular to the wear surface. Heat treatment using optimized heat treatment process, after used of this technology, the casting is of high hardness, good toughness, impact resistance and good wear resistance. In lithotripsy fields, our company developed a large-scale counterattack type crusher hammer.After the users test machine, it is wear resistance, improving equipment utilization rate .