Send your best offer for: Forged steel balls of 80 mm and 120 mm. The steel balls will be used in a mining unit Month consumption: -70 tones of forged steel balls of 80 mm in diameter -50 tones of forged steel balls of 120 mm in diameter Monthly delivery. The material which is grinded is copper deposits(copper mineral) -Chemical structure: -C=0.5 % -Mn=0.86 % -P=0.055 % -S=0.055 %