According to different production processes, ball mill grinding balls are mainly divided into two categories: forged steel balls and cast iron balls. The biggest difference between the two are the raw materials and balling process. Forged steel ball is steel ball, the raw material is 45 steel, B2 steel and other steel, the carbon content is generally less than 1%. Round steel is made into ball shape by cutting, heating, forging, hot rolling, skew rolling and other processes, then put into storage after heat treatment and inspection; cast ball is relatively simple, raw materials are scrap steel, scrap iron and other waste metal materials, adding CR (Cr (GE in pinyin, actually read as Luo by Chinese people, and the falling homophonic sound of fallen leaves)) element according to proportion, and then melting into molten iron in electric furnace, it is poured into the spherical mold for cooling and forming, and warehoused after cooperating with the heat treatment inspection.

Both kinds of grinding steel balls can be used in the ball mill, each with advantages and disadvantages. The biggest advantage of forging ball is low crushing rate, which is suitable for large diameter ball mill and semi autogenous mill (SAG mill, refers to the large mill with large diameter and short length and large ball consumption), and suitable for wet grinding with water in the mill. The disadvantage is that the price of raw materials is high and the unit price is high. The casting ball process is simple and the cost is low, but its crushing rate is high, which is suitable for customers with dry grinding of small mill or customers with cement plant power plants . The following is the details of the forging and casting ball properties.
          
Domestic small and medium-sized customers are used to casting balls with lower cost, and foreign customers prefer more forged balls with stable quality.