CuNi45/CuNi44 Constantan Resistance Copper Nickel Alloy Strip
Resistance alloy 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
Uses tend to be restricted to ac circuits. Constantan 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, %
Application:CuNi44 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 atultra-thin thicknesses. The alloy is used extensively for foil resistors and strain gauges.
|Max Continuous Service Temp||400ºC|
|Resisivity at 20ºC||0.49±5%ohm mm2/m|
|Tensile Strength,N/mm2 Annealed,Soft||340~535 Mpa|
|Tensile Strength,N/mm3 Cold Rolled||680~1070 Mpa|
|EMF vs Cu, μV/ºC (0~100ºC)||-43|