Equivalent Specifications
BS EN 12420 1999 CW 112C
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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DTD 498
DTD 498 is a UK Ministry of Defence specification designed for aerospace applications. 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 BS 2B 25, NFL 14-701, MSRR 8501, DIN 17672-1 and EN CW112C.
Description |
Silicon-Nickel-Iron Bronze
|
Nominal Composition |
CuNi3Si |
Alloy Type |
Bars & Forgings |
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 |
|