Conical Twin Screw For PVC Pipe,Profile,Sheet,Wood,Granules And Wpc

　　Material:High quality 38CrMoAlA

　　Process:Advanced nitriding & bimetallic process

　　Hardness After Hardening & Tempering:HB280-320

　　Nitrided Hardness:HV900-1000

　　Nitrided Case Depth:0.45-0.8mm

　　Material:38CrMoAIA,SACM645,AISI4140,SKD61,GHII3

　　Quenching Hardness:HRC55-62

　　Nitrided Brittleness:Less than Grade 2

　　Surface Roughness:Ra 0.4

　　Screw Straightness:0.015MM

　　Chromium plating layer hardness after nitriding:HV≥950HV

　　Chrome plate thickness:0.05-0.10MM

　　Alloy Depth:2.0-3.0MM

　　Screw Cooling:

　　1.inside is water/oil cooling system

　　2.outside is oil cooling system

　　Barrel Cooling

　　1.outside is air cooling system

　　2.out side is copper pipe around cooling system

　　Accessories:Stop ring and washers to adjust the space between screw and barrel