Constantan Cupro-Nickel CuNi44 Strip/Foil/Ribbon
Constantan As a big manufacturer and exporter in China on the line of electric resistance alloy, we can supply all kinds of electric resistance alloy wire and strips (resistance steel wire and strips),
Material: CuNi1, CuNi2, CuNi6, CuNi8, CuNi14, CuNi19, CuNi23, CuNi30, CuNi34, CuNi44.
1. CuNi44, also called Constantan, has a very low temperature coefficient, high electrical resistance, high ductility and non-corroding properties. It is suitable for use at temperatures up to 600° C (1110° F). As a very malleable, very ductile alloy, it has a very good resistance to oxidation.
The alloy is non-magnetic. It is suitable for electrical resistors, potentiometers, heating wires, heating cables and mats. Ribbons are used for heating of bimetals. Another field of application is manufacturing of thermocouples because it develops a high electromotive force (EMF) in association with others metals.
2. Chemical Composition
Alloy Ni% Mn% Fe% Cu%
CuNi44 43 Max 0.5 - Bal.
3. Products and services
1. Pass: ISO9001 certification;
2. Fine after-sale services;
3. Small order accepted;
4. Samples available;
4. Size
Wires: 0.018-10mm Ribbons: 0.05*0.2-2.0*6.0mm
Strips: 0.08*5.0-5.0*250mm Bars: D10-100mm
Chemical Content, %
| Ni |
Mn |
Fe |
Si |
Cu |
Other |
ROHS Directive |
| Cd |
Pb |
Hg |
Cr |
| 44 |
1% |
0.5 |
- |
Bal |
- |
ND |
ND |
ND |
ND |
Mechanical Properties
| Max Continuous Service Temp |
400ºC |
| Resisivity at 20ºC |
0.49±5%ohm mm2/m |
| Density |
8.9 g/cm3 |
| Thermal Conductivity |
-6(Max) |
| Melting Point |
1280ºC |
| Tensile Strength,N/mm2 Annealed,Soft |
340~535 Mpa |
| Tensile Strength,N/mm3 Cold Rolled |
680~1070 Mpa |
| Elongation(anneal) |
25%(Min) |
| Elongation(cold rolled) |
≥Min)2%(Min) |
| EMF vs Cu, μV/ºC (0~100ºC) |
-43 |
| Micrographic Structure |
austenite |
| Magnetic Property |
Non |
Application of Constantan
Constantan is a copper-nickel alloy that contains specific minor amounts of additional
elements to achieve precise values for the temperature coefficient of resistivity. Careful
control of melting and conversion practices results in a very low level of pinholes at
ultra-thin thicknesses. The alloy is used extensively for foil resistors and strain gauges.
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