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Forged Grinding Steel Balls SIZE: DIA 25-150MM HARDNESS: SIZE SURFACE CORE DIA25-90MM HRC 55-60 HRC 40-50 DIA100-150MM HRC 50-60 HRC 35-45 CHEMICAL ELEMENTS: C: 0.5-0.6, S: 0.04MAX, Mn: 0.6-1.0, P: 0...