twin screw barrel/Conical screw barrel for pvc,upvc,pe. We supply various types ... of screw barrels according to customer's requirement. Product name: Conical screw barrelKey word:screw barrel,bimetallic screw barrel,extruder screw ... molding machine.Material:38CrMoAlA,SKD11,SKD61,HPT2B,high quality alloy steel,etcTechnology:nitriding treatment,alloy coating sparying,heat-treatment,etcAppliance:PE ...