Screw and barrel for rubber machine Pin Screw and Barrel Specification: Ø75mm~Ø200mm Cold/Heat Feed Screw Specification: Ø65mm~Ø650mm Base Materials: 1)38CrMoAlA(JIS SACM 645) 2)42CrMo(AISI 4140) 3)Cr12MoV(JIS SKD-11) 4)4Cr5MoSiV1(JIS SKD-61) 5)9Cr18MoV DC53 (JIS G4404) Bimetallic Alloy Materials: 1)Fe-based alloy 2)Ni-based alloy 3)Co-based alloy 4)NiCo-based alloy 5)Wolfram carbide Bimetallic alloy level: Alloy powder including 40% Wolfram Carbon Alloy powder including 25% Wolfram Carbon Alloy powder including 9.5% Wolfram Carbon Processing Technology: Heat treatment High-frequency quenching Nitriding treatment Hard-chrome electroplating Bimetallic alloy welding Technical Parameter: Nitrided layer depth:0.50-0.80mm Nitrided hardness: 950-1100HV Nitrided brittleness: Less than 2 level Surface roughness: Ra 0.4μm Linearity of screw: 0.015mm/m Hard-chrome plating hardness after nitriding: ≥950HV Chrome-plating layer depth: 0.025~0.10mm Bimetallic layer depth: 3-5 mm We can manufacture all types of screws and barrels according to clients’ requirement.