The surface hardness of high chrome alloyed grinding balls can reach 65HRC, and the hardness gradient distribution is average, low abrasion, well tenacity, low breakage rate. The product quality is not lower than the GB/T17445-2009 standard. The casting grinding steel ball can increase cement specific surface area and the recovery rate of mine concentrate, meanwhile improve the production capacity of the mill, extend the service life of the mill liner, and greatly reduce the production cost of the enterprise.