1)Material:Bi-metallic,38CrMoAiA(JIS SACM645) 2.Nitriding treatmen 3.Electroplated hard-chrome finish

Single screw and barrel for extrusion machine

Material: 1)38CrMoAiA(JIS SACM645)

                 2) 42crMo(JIS SCM440)

                  3)SKD61

Heating-Treatment

Nitriding treatmentElectroplated hard-chrome finishHigh-frequency quenchingSpray coating Bimetallic-alloyVacuum quenching

Size of single screw and cylinder for extrusion machine:Diameter: 20mm~300mm

                                                                                                     Ratio of length to Diameter: L/D=15~55

Main technical specification 

1.Tempering hardness: 240~280HV

2.Nitride hardness: 900~1020HV

3.Nitride layer thickness: 0.5~0.8mm

4.Nitride brittleness: ≤2 grade

5.Surface roughness: Ra 0.4um

6.Screw straightness: 0.015mm

 Centrifugally casting Bi-Metallic Barrel by high speed in order to enable alloy and steel material with

 melted cadmium covered over inside the pipe.

Single screw and barrel for extrusion machine of Spray coating Bimetallic-alloy