coating bimetallic-alloy barrel screw

Base Materials:

1)38CrMoAlA(SACM 645)

2)40Cr

Bimetallic Alloy Materials:

1)Fe-based alloy

2)Ni-based alloy

3)Co-based alloy

4)Tungsten carbide

Processing Technology: 

Heat treatment

High-frequency quenching 

Nitriding treatment

Hard-chrome electroplating 

Bimetallic alloy welding

Bimetallic alloy centrifugal casting

Technical Parameter:

Nitrided layer depth:0.50-0.80mm

Nitrided hardness: 900-1100HV 

Nitrided brittleness: Less than 2 level

Surface roughness: Ra 0.4

Linearity of screw: 0.015mm

Chrome plating hardness after nitriding: ≥950HV

Chrome-plating layer depth: 0.025~0.10mm 

Bimetallic layer depth: 2 mm

Bimetallic hardness: HRC50-65