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GX300 Cr9Ni5Si2 Ni-hard Castings Cement Mill Spare Parts HB555 EB5068 Material Grade: 1.Martensitic Cr Mo AlloySteel(ZG50Cr5Mo,ZG60Cr6Mo,Cr12Mo): Hardness:≥HRC48, Impact value:≥25J. 2.High Cr white ...