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Screw structure and compression ratio can be designed according to different products and partsMaterials:(1) 38CrMoAlA (2) 9Cr18MOVSpray Coating Bimetallic-alloy Materials:(1)Carbide + Alloy (2)88Wc/12Co (3)CRC-NiCr (4)Ni60Processing Technology:Heat treatment, Nitriding treatment, High-frequency hardening, Spray coating bimetallic-alloy, Vacuum quenching.Technical detail:Nitriding depth: 0.5~0.8mmNitriding hardness: 950~1020HvNitriding brittleness: Less than grade oneRoughness of the surface: Ra 0.4μ MScrew straightness: 0.015mmThe surface hard chromium plating hardness: ≥ 950HvChromium-plating layer thickness: 0.03mm~0.08mmHardness of alloy: HRC62°Depth of alloy: > 2mm
