PVC extruder screw barrel
screw and barrel in 38crmoala materail
1.Size: screw diameter:Φ20-Φ500mm
Maximum screw length:10000mm
Barrel inner bore diameter:Φ500mm
2.Materail: A. 38crmoala in high quality
B. alloy steel in high quality
3.Technology: A. nitriding treatment
B. alloy coating spraying
C.heating treatment
D.screw fully hardening
E.vacuum quenching
F: electroplate hard chrome
4.Technical parameter: A: depth of nitrition layer: 0.6-0.8mm
B: nitriding treatment for 7 day and night, surface hardness HV>900
C: fragility of nitriding: less than grade 1
D: surface roughness: ra0.4um
E: streightness of screw: 0.015mm
F: depth of bimetallic layer>2mm
G: hardness of alloy platig: HRC 62-72
H: surface of hardness of chrome coating layer: HRC 62-72
I: thickness of chrome coating layer: 0.03-0.06mm