Blow Film Extrusion Screw

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Blow Film Extrusion Screw
We offer following specifications in bimetallic screws:
BASE MATERIAL
42CrMo(AISI 4140)
38CrMoAIA(EN-41B)
Stainless Steel SAE 304/316/410
Tool Steel AISI D2
DIMENSIONS
Screw Diameter
Maximum Screw Length(Single Part)
Screw Straightness
Screw Roughness
10-200 mm
7000 mm
0.01 mm/m
Ra 0.4
HEAT TREATMENT
Hardening & Tempering(Toughening) 285-345 HV (Hardness)
Stress Relieving
Gas Nitriding
Nitration Depth Hardness
0.5-0.8 mm 950-1150 HV
Screw Coatings
Type Hardness Thickness Wear Resistance Corrosion Resistance
Hard Chrome 800-1100HV 0.02-0.05 mm
Electroless Nickel 500-800HV 0.015-0.025 mm
SCREW ARMOURING
Type Hardness Coating Inlay Wear Resistance Corrosion Resistance
Ni Based(colmonoy) 52-58 HRC 1.5-3 mm
Co Based(stellite) 55-62 HRC 1.5-3 mm
SCREW ENCAPSULATION
Type Hardness Coating Inlay Wear Resistance Corrosion Resistance
Tungsten Carbide(WC) 68-72 HRC 0.15-0.25 mm
Chromium Carbide(CrC) 62-64 HRC 0.15-0.25 mm
Tin Coating 2300HV 0.002-0.010 mm
Blow Film Extrusion Screw