Screw Barrel for injection (extrusion,blow) molding machine Screw CoatingCoating typeCoating ThicknessCoating HardnessWear resistanceCorrosion resistanceHard Chore plating0.02-0.05mmHRC63°C******Chemical Nickel0.015-0.025mm HRC70°C******** Specification: Φ14mm-Φ300mm Material:SACM645,SKD61 Nitrided time:72hours surface hardness:HRC58 62 Nitrided case Depth:0.6-0.8mm Straightness:0.015mm/m Fragility of nitration:grade one Surface roughness:Ra0.4 L/D=18 28 Clamping force:25 3200tons APPLICATION: PP,PS,ABS,AS,PE,EVA,PVC,U-PVC,PO,PU etc…