Equivalent Specifications

BS EN 12420 1999 CW112C
BS EN 12165 1998 CW 112C

Key Features

A copper alloy containing nickel and silicon, that can be strengthened by heat treatment. Material solution heat treated at high temperature, has a soft supersaturated alpha-phase structure, and subsequent precipitation hardening at lower temperature precipitates finely dispersed nickel silicide in the matrix.

In this condition, the alloy exhibits high strength and hardness, combined with good wear resistance and conductivity. Cold working can further improve strength and hardness. The alloy has a good corrosion resistance in a variety of environments.

The most commonly used wrought forms are sheet, strip, rod and forgings.

Typical Uses

A high copper alloy with extremely good electrical and heat conductivity that is strengthened by heat treatment and cold work.

Has good corrosion resistance and ductility and is used mainly for fasteners. In the electrical industry it is used for switch gear and circuit breakers.

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BS 2B 25

BS 2B 25 is a UK Ministry of Defence specification designed for aerospace applications which supersedes BS B 25. The alloy CuNi3Si is an age hardening system which has high mechanical strength and excellent electrical and thermal conductivity. The alloy also has good corrosion and fatigue strength. It also meets the requirements of DTD 498 CuNi3Si, NFL 14-701, MSRR 8501, DIN 17672-1 and EN CW112C.

Description Copper Nickel Silicon
Nominal Composition CuNi3Si
Alloy Type Wrought

Typical Mechanical Properties

Tensile Strength (N/mm²) 212
Proof/Yield Strength (N/mm²) 226
Elongation (%) 28
Hardness Brinell 76
Impact Izod J20°C  

Typical Physical Properties

Density g/cm³ 8.8
Melting Temperature Range °C 1050-1070
Thermal Conductivity W/mK 20
Electrical Resistivity μΩ.m15°C 5.8
Coefficient of Thermal Expansion 0-250°C 16
Relative Magnetic Permeability < 1.01
Coefficient of Friction

Copper Alloys Ltd has the ability to modify existing alloys for improved performance. Many customers have benefited from this in the past.

To discuss your requirements, call a member of Copper Alloys Ltd's technical team on +44 (0) 1782-816888, or email sales@copperalloys.net.

This Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with tempeter, product and product dimensions. The information is based on our present knowledge and is given in good faith. However, no liability will be acepted by the Company in respect of any action taken by any third party in reliance thereon.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose.

Any advice given by the Company to any third party is given for that party's assistance only and without liability on the part of the Company. Any contract between the Company and a customer will be subject to the Company's Conditions of Sale. The extent of the Company's liabilities to any customer is clearly set out in those Conditions, a copy of which is available on request.