Parallel Twin Screw Barrel Bimetallic Screw Barrel

　　Technical Paremeters for parallel twin screw and barrel

　　Steel Material 38GrMoAlA,42GrMo

　　Hardness after hardening &tempering HB:280-320

　　Hardness &Tempering time 72 hours

　　Nitrided hardness HV:850-1000

　　Nitrided time 120hours

　　Depth of nitriding case 0.50-0.80mm

　　Nitrided Brittleness less than grade 2

　　Surface Roughness Ra:0.4

　　surface hardness of chromium- plating after Nitriding >HV900

　　Depth of chromium -plating 0.025-0.10mm

　　Alloy Hardness HRC:50-65

　　Alloy Depth 0.8-2.0mm

　　Application:

　　PE, PP, ABS, rubber, various high glass fiber, mineral fiber and PPA,PPS, PA6T, LCP,VO fire protection, ferrous power, magnetic powder, etc.

　　For recylced plastic material, PVC + 30% CaCo3, etc