Material: 38CrMoAlA , 40CrMo , 42CrMo Technology: nitriding treatment, alloy coating spraying.

Size: screw diameter:Φ20-Φ500mm

      Maximum screw length:10000mm

      Barrel inner bore diameter:Φ500mm

 

Depth of nitrition layer: 0.5-0.8mm

Nitriding treatment, surface hardness: HV≥900-1000

Fragility of nitrition: less than grade 1

Surface roughness: Ra 0.4um

Streightness of screw: 0.015mm

Surface of hardness of nitrated Cr coating layer: ≥950HV

Hardness of Cr coating layer: HRC55-62

Thickness of alloy plating: 0.03-0.08mm

Depth of alloy layer:>2mm

Used for granulation,PP, PE, PA, PC, ABS,AS etc