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            Extruder screw barrel technical indicators

            Technical indicators:

            Material selection high-quality 38 chromium molybdenum aluminum (38CrMOALA) hardening and tempering Hardness: HB240 ~ 280

            Nitriding hardness: HV ≥ 850

            Nitriding depth: 0.45 ~ 0.80mm

            Nitriding brittleness: ≤ two

            Surface roughness: Ra0.4

            Straightness of screw: 0.015mm

            Hard chrome plating after nitriding: HV ≥ 900

            Chrome plating thickness: 0.03 ~ 0.10mm

            Double alloy hardness: HRC56~65 (alloys use nickel base alloy)

            Alloy depth: 1.2~3.0mm

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