Specification:

Diameter:D45mm-D200mm

L/D ratio:16-35

Product classification

The compression ratio of screws can be designed according to different products and ingredients

Base  Materials:

1.38CrMoAIA(JIS SACM645)

2.42 CrMo (AISI 4140)

3.4Cr5MoSiV1(JIS SKD-61)

4.9Cr18MoV

5.HPT

 

Bimetallicalloy materials:

1.Fe-based alloy

2.Ni-based alloy/Deloro alloy

3.Co-based alloy

4.NiCo-based alloy

5.Tungsten carbide/Wolfram carbide

 

Technics:

Heat treatment

High-frequency quenching

Nitriding treatment

Hard-chrome electroplating

Bimetallic alloy  welding

Bimetallic alloy centrifugal casting

 

Technical parameter:

Nitrided layer depth: 0.5-0.8mm

Nitrided hardness: 900-1000HV

Nitrided brittleness: less than grade 1

Surface roughness: Ra0.4

Linearity of screw: 0.015mm

Hard-chrome plating hardness after nitriding: >950HV

Chrome-plating layer depth: 0.025-0.085mm

Bimetallic layer depth: 3mm