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Roller shell material:50Mn/45#
Surface Hardness:HRC48-58
Quench depth:>4mm
Roller shaft material:45#
Surface Hardness:>2mm
Base collar material:QT450-10/45#
Developed scope: below 100 series,100 series,200 series,300 series,400 series,600 series,800 series,1200 series