Bimetallic Screw For Extrusion Machine PC Special Screw 

Specification: φ15 mm -φ250 mm , L/D = 15 ~ 45    Screw take base material of 38 CrMoAla or SACM645, SKD61, din 1.8519 and 1.8550, material, screw surface spraying nickel base tungsten carbide alloy, alloy thickness 1.5mm ~ 1.5 mm, hardness reach HRC62-65, with the characteristics of  high wearing resistance and corrosion resistance ,mainly apply for the PVC pipes, PE plastic foam, EPE pearl cotton board, XPS extruded plate, PE pipe, PPR pipe, cable machine, chemical fiber machine, wood and plastic, blown film machine, recycling granulator machine, the service life is 3-5 times longer than the nitrided one.    Screw can be selected from ordinary, gradual, pinned,shielding, separating and exhausting type, the compression radio of screw can be designed according to different raw materials and machinery.