good wear resistance screw and barrel for plastic machines Specification: Diameter: Φ 45mm-Φ 200mm L/D ratio: 16-35 The compression ratio of screws can be designed according to different products and ingredients Technical Information Base Materials: 1)38CrMoAlA(JIS SACM645) 2)42CrMo(AISI 4140) 3)4Cr5MoSi V1 (JIS SKD-61) 4)9Cr18MOV 5)HPT Bimetallic alloy materials: 1)Fe-based alloy 2)Ni-based alloy/Deloro alloy 3)Co-based alloy 4)NiCo-based alloy 5)Tungsten carbide/Wolfram carbide Technics: Heat treatment High-frequency quenching Nitriding treatment Hard-chrome electroplating Bimetallic alloy welding Bimetallic alloy centrifugal casting Technical parameter: Nitrided layer depth: 0.5-0.8mm Nitrided hardness: 900-1000HV Nitrided brittleness: Less than grade 1 Surface roughness: Ra0.4 Linearity of screw: 0.015mm Hard-chrome plating hardness after nitriding: >=950HV Chrome-plating layer depth: 0.025-0.085mm Bimetallic layer depth: 3mm Our advantages: 1)Excellent raw materials 2)Good customer service 3)Rapid delivery 4)Reasonable price 5)Production quickly