... screw barrels according to customer's requirement. Product name: Conical screw barrelKey word:screw barrel,bimetallic screw barrel,extruder screw barrel,screw barrel for injection molding machine,twin screw ... barrel,screw barrel for extruder machine,screw barrel for injection molding machine.Material:38CrMoAlA,SKD11,SKD61,HPT2B,high quality alloy steel ... :Common nitrided:1-2years,Bimetallic ...