Bimetallic Twin Parallel Screw Barrel for Compounding MachineryDiameterΦ15mm-Φ350mm Screw structure and compressionDesigningratio can be designed according  to different products  & different output requirement.Materials38CrMoAlA  ApplicationPVC plate, pipe, profile, pellet and mould, at the same time,(JIS SACM645)it solved the technical problem of low foaming, high foaming,SKD61high filling, wear and corrosion.Nitride Case Depth0.5mm-0.8mmTechnology1)Longer time Gas Nitriding treatment Nitride Hardness950-1020HVPackingWrapped up by film in woodenNitride Brittleness≤Grade OnePayment TermT/T , L/C Surface RoughnessRa0.4umDelivery Term25 working daysScrew Straightness0.015mmPort DepartureShanghai/NingboAlloy HardnessHRC58-62Min. Order1 setAlloy Depth0.5mm-0.8mmCommon Nitrided:2.5-4years  Bimetallic: much longer lifetime.