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