Cuni44

These 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 600A C (1110A 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
AlloyNi%Mn%Fe%Cu%
CuNi4443Max 0.5-Bal.
Physical Data
Density 8.9 g/cm3
Specific Heat 0.41(J/kg 20A C)
Electrical Resistivity0.049A 10-6ohm.m
Melting Point1210A C
Maximum Operating Temperature600A C
Coefficient of linear expansion (coeff 10-6/A C)14 from 20 to 1000A C
Typical Mechanical Properties
Mechanical PropertiesCuNi44
Tensile Strength420 Mpa
Elongation25%