Grinding steel ball for grinding mill (grinding ball for shorter) is a kind of pulverizing media in ball mill to crush the materials in the mill. After in-depth discussion and analysis, combining with actual working condition of ball mill, grinding ball (specially for ball mill) with higher volume hardness and better wearability is developed through research and promotion of steel ball material and supporting heat treatment process. It improves grinding efficiency effectively without lowering grinding effect, which is beneficial for energy saving and consumption reduction of mines. With 800,000t annual output, grinding ball, mainly applied to metallurgical mines, are sold to Southeast Asia, Australia, Africa, North America, Central and South America and other countries and regions.