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60mn 65mn B2 B3 B4 B6 Bu Forged and Hot Rolling Grinding Media Steel Balls for Mining Industry 1 Inch to 5.5 Inch Hardness 60-65HRC, Find Details and Price about Grinding Balls Grinding Media Balls from 60mn 65mn B2 B3 B4 B6 Bu Forged and Hot Rolling Grinding Media Steel Balls for Mining Industry 1 Inch to 5.5 Inch Hardness 60-65HRC - Shandong Jinchi Heavy Industry Joint-Stock Co., Ltd