The steel grinding balls are the Grinding material medium in the ball mills, working through the ball—ball, and ball-materials to generate the friction function, widely used in cement factory and electric power station etc. In some special conditions, the grinding operation requires different steel grinding balls which fixed by other metal material to achieve the final function in different circumstance. In fact, plenty different special material steel balls haven been used in kinds of industries,including: The high chrome steel balls,the low chrome steel balls, Complex alloy steel balls and other wearable steel balls.