C111 / CW114A / Sulphur Copper

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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.

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Holme Dodsworth Metals Limited.
59/69 Heaton Park Road.
Newcastle Upon Tyne NE6 1SQ
Registered in England. Company No. 00842702