Chinese plastic machine components bimetallic screw Diameter Φ15mm-350mm Designing Screw structure and compression ratio can be designed according to different products & different output requirement. Materials 38CrMoAlA (JIS SACM645) SKD61 Application Suit for PE,PP,PC,PVC,ABS,PET,PS.. recycling. Nitride Case Depth 0.5mm-0.8mm Technology 1)Longer time Gas Nitriding treatment ...