Twin Conical Screw Barrel

 Standard spcifications of conical twin screw barrel(d/D)

24/52

35/76

45/90

45/100

50/105

51/105

55/100

55/120

58/124

60/125

65/120

65/132

68/143

70/135

70/140

75/150

80/143

80/156

92/188

 105/213

Technical parameter of conical twin screw and barrel

 Main base

 materials

1.38CrMoAlA  (Nitrided Steel)

2.SKD-61 (Special Tool Steel)

3.42CrMo (Ultrahigh Strength Steel)

4.DC53 (Cold Work Die Steel) 

5.W6Mo5Cr4V2 

6.HPT

Main alloy 

materials

1.Ni-based alloy

2.Tungsten carbide

3.NiCo-based alloy

4.Fe-based alloy

5.Co-based alloy  

Processing 

technics

1.Heat treatment

2.Quenching

3.Nitriding treatment

4.Bimetallic alloy welding

5.Bimetallic alloy centrifugal casting

6.Hard-chrome electroplating

Technical 

parameter

1.Nitrided layer depth: 0.5-0.8mm

2.Nitrided hardness: HRC56-58

3.Nitrided brittleness: ≤Grade 1

4.Surface roughness: Ra0.4

5.Linearity of screw:0.015mm

6.Hard-chrome plating hardness:≥HRC57

7.Chrome-plating layer depth: 0.03-0.09mm

8.Bimetallic layer depth: 3mm

9.Bimetallic layer hardness: HRC58-62

Above are main technical information,a suitable screw and barrel will be made according to your requirement