Constantan 40

Chemical Content, %

Ni Mn Fe Si Cu Other
40 1 - - Bal -

Mechanical Properties

Property Name Value
Max Continuous Service Temp 400℃
Resisivity at 20℃ 0.48±5%ohm mm2/m
Density 8.9 g/cm3
Thermal Conductivity -6(Max)
Melting Point 1280℃
Tensile Strength, N/mm2 Annealed,Soft 340~535 Mpa
Tensile Strength, N/mm2 Cold Rolled 680~1070 Mpa
Elongation(anneal) 25%(Min)
Elongation(cold rolled) 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.