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.
Chemical Composition
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Alloy
|
Ni%
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Mn%
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Fe%
|
Cu%
|
|
CuNi44
|
43
|
Max 0.5
|
-
|
Bal.
|
Physical Data
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Density
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8.9 g/cm3
|
|
Specific Heat
|
0.41(J/kg 20°C)
|
|
Electrical Resistivity
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0.049×10-6ohm.m
|
|
Melting Point
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1210°C
|
|
Maximum Operating Temperature
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600°C
|
|
Coefficient of linear expansion (coeff 10-6/°C)
|
14 from 20 to 1000°C
|
Typical Mechanical Properties
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Mechanical Properties
|
CuNi44
|
|
Tensile Strength
|
420 Mpa
|
|
Elongation
|
25%
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