rubber extruder screw barrel

diameter of pin screw and barrel:  Φ75-Φ200mm

diameterof cold feed or hot feed screw and barrel: Φ30mm-300mm 

L/D ratio:12-18

technical parameter

Depth of Nitrated Layer: 0.5-0.8mm          

Hardness of nitration: 900-1020Hv
Fragility of nitration: Less than grade 1       

Surface roughness: Ra 0.4um 
Hardness of Cr-coating Layer: ≥950Hv       

Thickness of Cr-coated Layer: 0.03-0.08m

Hardness of Bimetallic Layer: HRC55-72          

Depth of Bimetallic Layer: >2mm