PVC Screw barrel

Material:

Alloy-steel of high-quality

1)38 CrMoAIA(JIS SACM645)

2)42CrMo(AISI4140)

3)9Cr18MOV

4)CW6Mo5Cr4V2

5)SKD61

Heat-treatment

Nitriding treatment

Electroplate hard-chrome

High-frequency quenching

Spraying corrosion wear-resisting dual metal layers

Vacuum quenching

Technical Parameter

Steel Material: DIN 41CrA1Mo7 / AST M4140 / GB 38CrMoAlA

Deepness of Nitriding Layer: 0.4 mm -0.8 mm

Hardness of Nitriding: HV900 - HV1, 000

Nitriding Brittleness: ≤ Grade 1

Chromate plating: Thickness 0.05 mm - 0.10 mm, hardness HV950

Special treatment: Carbide coating on screw flight and bimetallic barrel

Screw straight tolerance: 0.015 mm/m

Surface roughness: Ra 0.4μm