Technical Parameter of Injection Screw Barrel Base Material 1) 38CrMoAlA(JIS SACM645);2) Cr12MOV(JIS SKD-11) ; 3) 4Cr5MoSiV1(JIS SKD-61) ;4) 42CrMo(AISI 4140)   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   Double-alloy level Level A – containing Tungsten of 40% Level B – containing tungsten of 25% Level C – containing tungsten of 15%   Surface Treatment Heat Treatment High Frequency Treatment Nitriding treatment(120 Hours): Depth of Nitrided Layer: 0.5-0.8 mm Hardness of Nitrided Layer: 900-1020Hv (HRC56°-65°) Hard Chrome Plating treatment: Thickness of Hard Chrome Plating Layer: 0.05-0.10mm Hardness of Hard Chrome Plating Layer: ≥950HV Nickel alloy plating.treatment: Bimetallic Barrel/Cylinder: Centrifugal Casting (Inlay Alloy) Bimetallic Screw: Plasma Alloy Coating Spraying Depth of Bimetallic Layer: >2mm Hardness of Bimetallic Layer: HRC55°-72° Spraying corrosion wear-resisting dual metal layers