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