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1. HF-A Carbon Hot Rolling Steel Cylpeb Chemical Composition C(%)Si(%)Mn(%)Cr(%)Cu(%)Mo(%)P(%)S(%)0.42-0.500.17-0.370.50-0.800.25max=0.25=0.30=0.035=0.035Size 20*30-50*60mm; 25*35-55*65mm Hardness SeriousSurfaceVolume HardnessStandard Hardness48-53HRC46-51HRCHigh Hardness52-55HRC50-53HRCImpact Value =12J/CM^2Balls Number =12000timesMicrostructure M+C Production Process Manual put material into storage rack?automatic continued feeding device?stokehole pinch roll feeding device?furnace heating?pinch roll discharging speediness discharging?enter into rolling ball machine?rolling ball quenching sy