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By certification 
Bimetallic screw barrel
Bimetallic barrel is a kind of barrels which have be casted a layer of 2-3mm corrosion & abrasion resistant alloy on the inner wall.
Specifications:
Screw diameter:OD15mm-250mm
Screw Length: 300mm-8000mm
Barrel outer diameter: OD 40mm-400mm
L/D:10-46
Bimetallic Alloy Materials:
Fe-based alloy
Ni- based alloy/Deloro alloy
Co- based alloy
NiCo-based alloy
Tungsten carbide/Wolfram carbide
Double–alloy level |
Level A – containing Tungsten of 40% |
Level B – containing Tungsten of 25% | |
Level C – containing Tungsten of 9.5% |
Techinical Parameter |
Depth of nitration |
0.5-0.8mm |
Hardness of nitration |
950-1020HV |
|
Straight of screw |
0.0015MM |
|
Fragility of nitration |
Less than grade 1 |
|
Roughness of surface |
Ra 0.4um |
|
Depth of alloy layer |
2-3mm |
|
Hardness of alloy |
HRC58-62 |
|
Hardness after hardending and tempering |
HB260-290 |
|
Hard chrome plating thickness |
0.03-0.08mm |
|
Hardness of hard chrome plating |
≥950HV |
Characteristics |
Alloy |
Harding (HRC) |
Base material |
Abrasion resistance |
Fe+Ni+Cr+B |
58-64 |
45/40Cr |
Anti-corrosion |
Ni+Cr+Co+B |
50-58 |
45/40Cr |
Abrasion resistance & Anti-corrosion |
Fe+Ni+Cr+Co+B |
56-64 |
45/40Cr |
High Abrasion resistance & Anti-corrosion |
Ni+Cr+Wc+Co+B |
58-67 |
45/40Cr |
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