High performance single screw barrel for extrusion 1.We are a professional company specialized in manufacturing many types of screw, the barrel can be applied on all types of injection moulding machine,rubber hot-feeding extruder, rubber cold-feeding extruder, pin barrel cold feed extruder, plastic extruder with different specifications. 2.The models of screw include: Variable pitch and variable depth, variable pitch and equal depth, variable depth and equal pitch, and equal depth and pitch. Groove multi-die type, composite type, mixing type and separating type. 3. The material of screw: manufactured with high-quality nitro alloy steel, applying the method of hardening and tempering and nitriding, thus it enjoys the characteristics of long working life, wear resistance, and anti corrosion. Besides, the technique of hard alloy spraying or chrome plating can be used on the working surface of screw, which will make it have better using effectiveness. Material: Alloy-steel of high-quality 1)38 CrMoAIA(JIS SACM645) 2)42CrMo(AISI4140) 3)9Cr18MoV 4)CW6Mo5Cr4V2 5)SKD61 Process: Heat-treatment Nitriding treatment Electroplate hard-chrome High-frequency quenching Spraying corrosion wear-resisting dual metal layers Vacuum quenching Technical Parameter Steel Material DIN 41CrA1Mo7 / AST M4140 / GB 38CrMoAlA Deepness of Nitriding Layer 0.7 mm -0.9 mm Hardness of Nitriding HV900 - HV1,000 Nitriding Brittleness ≤Grade 1 Chromate plating Thickness 0.05 mm - 0.10 mm, hardness HV950 Special treatment Carbide coating on screw flight and bimetallic barrel Screw straight tolerance 0.015 mm/m Surface roughness Ra 0.4μm