Screws for Film Blowing Machines


Standard Grade: 38crmoala + Nitriding 140 Hours
Bimetallic Grade: 38CrMoAIA + Bimetallic Alloy
Steel Material: 38CrMoALA, SKD61, SKD11, D2 etc.
Diameter of Screw: D12-D300 mm
L/D Ratio of Screw: 10-50
Hardness after Heat treatment: HB240-280
Nitriding Treatment Time: ≥96 hours
Surface Hardness degree: 58-64 HRC
Nitrided Layer thickness: 0.5-0.8mm
Surface Roughness: Ra0.4 um
Screw Straightness: 0.015mm
Cr-Plated Surface Hardness after Nitriding: ≥900HB
Chromium-Plating Layer Thickness: 0.05-0.10 mm
Bimetallic Layer Hardness: 58-65 HRC
Bimetallic Layer Depth: 0.8-2.0 mm 

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