Basic parameters:
technical parameter:

Quenching and tempering hardness: HB260-290

Nitriding hardness: HV950-1050

Screw diameter from Φ16-Φ280

Effective length of screw: 810mm~6500mm

Surface roughness: Ra0.4um

Screw straightness: 0.02mm

Hard chrome plated hardness after nitriding: ≥950HV

Chrome plating thickness: 0.03-0.05mm

Double alloy hardness: HRC55-62

Nitrided layer depth: 0.4-0.7mm

Nitriding brittleness: ≤ one level

Surface roughness: Ra0.4

Screw straightness: 0.015mm

Surface chrome plating hardness after nitriding: ≥900HV

Chrome plating thickness: 0.05-0.10mm

Double alloy hardness: HRC56-65

Double alloy depth: 0.8-2.0mm

Materials and processes:

High quality 38CrMoAlA, SKD61; 40Cr; 42CrMo, 304 stainless steel and other materials, high quality stainless steel, high quality powder metallurgy materials

Cold, hot spray hard metal process, advanced nitriding process, corrosion resistant, wear resistant bimetal spraying process.

product type:

Screw diameter from Φ16-Φ280

Effective length of screw: 810mm~6500mm

Surface roughness: Ra0.4um

Screw straightness: 0.02mm

Hard chrome plated hardness after nitriding: ≥950HV

Chrome plating thickness: 0.03-0.05mm

Double alloy hardness: HRC55-62