parallel twin screw and barrel for plastic extruder machine

Specifications

Meterial:

Alloy-steel of high-quality

1)38 CrMoALA(JIS SACM645)

2)42CrMo(JIS SCM440)

3)9 Cr18MoV

4)CW6Mo5Cr4V2

Technics

Heat-treatment

Nitriding treatment

Electroplate hard-chrome

Spraying corrosion wear-resisting dual metal layers

Technical parameter: 
1): Depth of Nitration Layer: 0.5-0.8mm 
2): Hardness of Nitration: 900-1000HV 
3): Fragility of Nitration: Less than grade 1 
4): Roughness of the surface: Ra0.4 
5): Straightness of the screw: 0.015mm 
6): Surface hardness of Nitrated Cr coating Layer: ≥950HV  
7): The thickness of Chrome-plating layer: 0.025-0.085mm 
8): Depth of alloy Layer: 0.8-2mm.