Single screw and barrel for extrusion machine

Material: 1)38CrMoAiA(JIS SACM645)

                 2) 42crMo(JIS SCM440)

                  3)SKD61

Heating-Treatment

1. Nitriding treatment
2. Electroplated hard-chrome finish
3. High-frequency quenching
4. Spray coating Bimetallic-alloy
5. Vacuum 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.