C111 / CW114C / Sulphur Copper
C111 (CW114C, Sulphur Copper)
C111 (CW114C, Sulphur Copper): C111 introduces sulphur into the copper matrix, enhancing machinability while maintaining good electrical conductivity.
It finds purpose in applications requiring intricate shapes and precise machining.
Connectors, fasteners, and intricate components benefit from C111's ease of machining and reasonable conductivity.
C111 / CW114C is a free machining sulphur copper with a machinability rating of approximately 80% (free machining brass = 100%). The addition of sulphur to the copper creates Cu2S copper sulphide within the microstructure that acts as a chip breaker and forms the basis of the free machining capacity.
The free cutting properties of sulphur copper combined with its high retention of electrical and thermal conductivity values (usually only associated with purer coppers) enables its use in a wide variety of applications. The C111 / CW114C can also be machined at much higher speeds with lower tool wear, giving machinists and designers a more cost effective product.
Sulphur copper is de-oxidised during its manufacture by adding phosphorus, and as a result the material offers a freedom from hydrogen embrittlement. Other benefits of C111 / CW114C are high corrosion resistance, a very good formability and can be joined easily by soldering.
Chemical Composition
|
Copper |
Rem |
|
Sulphur |
0.2–0.7% |
|
Phosphorus |
0.003-0.012% |
|
Total Imps |
0.1% max |
Related Specifications
|
C111 |
CW114C |
|
CuSP |
C14700 |
Key Features
- Excellent Electrical Conductivity
- Free Machinability
- Freedom from Hydrogen Embrittlement
- Very Good thermal conductivity
- High corrosion resistance
Typical Physical Properties
|
Melting Point |
1079°C |
|
Density |
8.94 g/cm³ |
|
Specific heat |
385 J/Kg °K |
|
Thermal conductivity |
347 W/m°K |
|
Thermal expansion coefficient (20-200°C) |
17 x 10-6 per °C |
|
Electrical conductivity |
93% IACS |
|
Electrical resistivity |
0.0181 microhm m |
|
Modulus of elasticity |
12500 Kg/mm² |
Fabrication Properties
|
Hot Working Temperature Range |
750-870°C |
|
Hot Formability |
Good |
|
Cold Formability |
Good |
|
Cold reduction between anneals |
70% max. |
|
Machinability rating (free cutting brass = 100) |
80 |
Joining Methods
|
Soldering |
Excellent |
|
Brazing |
Good |
|
Oxy-acetylene welding |
Not Recommended |
|
Gas-shielded arc welding |
Not Recommended |
|
Resistance welding: Spot and Seam Butt |
Not recommended Fair |
Typical Uses:
Traditional uses for C111 / CW114C Sulphur Copper are electrical components that require high conductivity values combined with free machining properties including; transformer and circuit breaker terminals, electrical contacts and connectors, clamps, cable glands and fasteners.
This technical information is given by Holme Dodsworth Metals without charge and the user shall employ such information at their own discretion and risk. For more detailed technical advice on temper selection, fabrication, joining, machining, physical and mechanical data please contact us as space does not permit the listing of every feature of the material.