Forged Steel Balls,Mill Balls are mainly used in gold/copper/silver/zinc mines, power plants and cement factories. Forged Steel Balls,Mill Balls:Our Forged Steel Balls,Mill Balls, with diamater from 20mm to 150mm, is very good in breakage and erosion. It is widely used for powder preparation and extra-fine deep processing in sectors such as cement building materials, metal mining, coal paste ...