Tungsten Carbide Single Facer Corrugated Roller 1.Material :Special 48CrMo alloy steel fine forgings 2.Hardness:>HRC58 Quenching layer depth :5-7mm 3.Coating Thickness 0.06and 0.07mm Tungsten Coating Thickness 4.Surface plating: Micro hardness HV900-1250 5.Combination hardness >75MPa 6.Visible optical porosity