We supply various types of screw barrels according to customer's requirement.

Product name:extruder screw barrel

Material:38CrMoAlA,SKD11,SKD61,high quality alloy steel,etc

Technology:nitriding treatment,alloy coating sparying,heat-treatment,etc

Appliance:PE,PVC,PP,etc

Technical index:

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: 0.03-0.08mm

Hardness of Bimetallic Layer: HRC55-72      

 Depth of Bimetallic Layer: >2mm

Guarantee:Common nitrided:1-2years,Bimetallic:much long time...