Product name: Twin Conical screws and barrels

Size: Diameter 35/75- 92/188mm

Material: 38CrMoAlA;   SKD61;  SKD11;  40Cr;  42CrMo;  high quality alloy steel

Technology:  nitriding treatment, alloy coating spraying, heat-treatment

Appliance: PA, EVOH, EAA, PC etc

Technical Index:  

Depth of Nitrated Layer: 0.5-0.8mm

Hardness of nitration: 900-1020Hv

Fragility of nitration: Less than grade 1

Surface Hardness of Nitrated Cr coating layer: ≥950Hv

Hardness of Bimetallic Layer: HRC55°-72°

Thickness of Cr-coating Layer: 0.03-0.08mm

Depth of Bimetallic Layer: >2mm