Extruder screw barrel for blowing film extruder machine

Material: 38 CrMoAlA(JIS SACM645); 42 CrMo(JIS SCM440)
Depth of nitrogen layer: 0.6~0.8mm
Nitrided Brittleness: above 1 stage
Surface Roughness: Ra0.4 um
Screw straightness: 0.015mm
Hardess of surface chromium-plating after Nitriding: HV≥950HV
Chromium plating Depth: 0.025-0.085mm
Alloy Depth: 2.5mm-4mm

Products Are Processed By The Following Steps:
Hot Treatment
Nitriding Treatment
Electroplating Hard-chrome layer
Hi-frequency Quenching
Spray Coating Bimetallic Layer Of Corrosion And Abrasion Resistant
Vacuum Quenching