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  Bimetallic Screw and Barrel

The bimetallic screw and barrel are made of two metals or two metal alloys, which can improve the wear resistance and corrosion resistance of the screw and barrel.

Backing Material / Property Hardness Principal Application
S45C HS 24~28 Extruder
SCM440 HS 28~40 Extruder&Injection molding machine
TCB-S07 HS 35~45 High-pressure Injection molding machine
SUS316 HRC 18~28 For corrosion resistant parts
TCB Kinds and Major Compostion Wear-resistant and Corrosion-resistant Hardness(HRC)   Hardness level Temp. Range Thermal Expansion Co-efficient (Alloy)
Nickel-based alloy include 15% Wc and 15% Co for bimetallic barrel
TCB-12
Ni-Wc-Co-Fe-Cu-B
Nickel-based Alloy
(Wc15%、Co15%)
60~62
2.5m/m <=400 11.0x10-6
11.4x10-6
Nickel-based alloy include 30% Wc and 15% Co for bimetallic barrel
TCB-20
Ni-Wc-Co-Fe-Cu-B+Cr,Mo,V
Nickel-based Alloy
(Wc30%、Co15%)
66~68
2.5m/m <=450 11.4x10-6
12.1x10-6
Nickel-based alloy include 15% Wc and 30% Co for bimetallic barrel
TCB-60
Ni-Co-Wc-Cr-B-Si-B
Nickel-based Alloy
(Wc30%、Co15%)
54~56
2.5m/m <=450 11.9x10-6
12.4x10-6
The explanation of A,B,C symbols for bimetallic barrel performance
TCB Kinds and Major Compostion Resin Category
Nickel-based alloy include 15% Wc and 15% Co for bimetallic barrel
TCB-12
Ni-Wc-Co-Fe-Cu-B
Nickel-based Alloy
(Wc15%、Co15%) 		General Resin
Applicable Resin: Corrosion Resistance: Medium
Glass Fiber Content: Within 30%
PE, pp, ABS, AS, PS, TPE
Thermosetting Resin: EP, PU, PE, UP
Engineering Resin
Applicable Engineering Resin: Corrosion Resistance: Medium
Glass Fiber Content: Within 30%
PA, PC
Nickel-based alloy include 30% Wc and 15% Co for bimetallic barrel
TCB-20
Ni-Wc-Co-Fe-Cu-B+Cr,Mo,V
Nickel-based Alloy
(Wc30%、Co15%) 		General Resin
Applicable Resin: Corrosion Resistance: High
Glass Fiber Content: Over 30%
PE, PP, ABS, AS, PS, TPE
Salted resin PVC
Engineering Resin
Applicable Engineering Resin: Corrosion Resistance: High
Glass Fiber Content: Over 30%
PA, PC, PBT, PET, POM, PPO, PEEK, LCP, PPS, PAR, PES.
Special Engineering Resin: Corrosion Resistance: High
Glass Fiber Content: Over 30%
Nickel-based alloy include 15% Wc and 30% Co for bimetallic barrel
TCB-60
Ni-Co-Wc-Cr-B-Si-B
Nickel-based Alloy
(Wc30%、Co15%) 		General Resin
Applicable Resin: Corrosion Resistance: High
Glass Fiber Content: Over 30%
PE, PP, ABS, AS, PS, TPE,
Salted resin PVC
Engineering Resin
Applicable engineering Resin: Corrosion Resistance: High
Glass Fiber Content: Over 30%
PA, PBT, PET, POM, PC, PPO, PAR
Special Engineering Resin: Corrosion Resistance: High
Glass Fiber Content: Over 30%