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Constantan Wire CuNi40 Nickel copper flat wire

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Constantan Eureca  Wire / Flat Wire

Product Description
Constantan Wire with moderate resistivity and low temperature coefficent of resistance with a flat resistance/temperature curve over a wider range than the “manganins”. Constantan also shows better corrosion resistance than the man ganins. Uses tend to be restricted to ac circuits.
Constantan wire is also the negative element of the type J thermocouple with Iron being the positive; type J thermocouples are used in heat treating applications. Also, it is the negative element of the type T thermocouple with OFHC Copper the positive; type T thermocouples are used at cryogenic temperatures.

Chemical Content, %

Ni Mn Fe Si Cu Other ROHS Directive
Cd Pb Hg Cr
44 1.50% 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

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