20-150mm B2 High Impact Toughness Forged Grinding Balls for Ore Grinding

20-150mm B2 High Impact Toughness Forged Grinding Balls for Ore Grinding. Our Forged Grinding balls produced by advanced automatic rolling machine ( Balls from 20mm-70mm) + Labor Air Hammer ( 80mm-150mm) with special Heating treatment and strict quality control systerm , wh. Raw Material Purchase :Strategic partnership with standard steel enterprise and sign the long term agreement.Purchase directly from Chinese famous standard steel enterprise . We have special department of QC teamwork .The team is responsible for inspection during production , inspection before delivery .