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50mm Heat-Treated Wear-Resistant Grinding Steel Balls for Ball Mills. 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 . 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 .