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CuNi40(6J40) Alloy Copper Nickel Constantan Wire

Short Description:

Copper Nickel Alloy is mainly made of copper and nickel. The copper and nickel can be melted together no matter what percentage. Normally the resistivity of CuNi alloy will be higher if the Nickel content is larger than Copper content. From CuNi1 to CuNi44, the resistivity is from 0.03μΩm to 0.49μΩm. That will help the resistor manufacture choosing the most suitable alloy wire.

  • Resistivity: 0.48+/-5%
  • Material: Copper nickel alloy
  • Surface: bright
  • Application: resistor,
  • Size: customized
  • sample: Accepted small order
  • Density: 8.9g/cm3
  • Product Detail


    Product Tags

    The copper-based low resistance heating alloy is widely used in low-voltage circuit breaker, thermal overload relay, and other low-voltage electrical product. It is one of the key materials of the low-voltage electrical products. The materials produced by our company have the characteristics of good resistance consistency and superior stability. We can supply all kinds of round wire, flat and sheet materials.

    Constantan is CuNi40,also named 6J40,it is a resistance alloy which is mainly made up of copper and nickel.
    It has the low resistance temperature coefficient,wide working temperature scope(500 below),good machiningproperty,anti-corrosive and easy braze welding.

    The alloy is non-magnetic. It is used for electrical regenerator’s variable resistor and the strain resistor,
    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.

    Copper nickel alloy series:Constantan CuNi40 (6J40), CuNi1, CuNi2, CuNi6, CuNi8, CuNi10, CuNi14, CuNi19, CuNi23,CuNi30, CuNi34, CuNi44.

    Main grades and properties

    Type Electrical resistivity
    temperature coefficient of resistance
    Max. temperature
    Melting point
    CuNi1 0.03 <1000 8.9 / 1085
    CuNi2 0.05 <1200 8.9 200 1090
    CuNi6 0.10 <600 8.9 220 1095
    CuNi8 0.12 <570 8.9 250 1097
    CuNi10 0.15 <500 8.9 250 1100
    CuNi14 0.20 <380 8.9 300 1115
    CuNi19 0.25 <250 8.9 300 1135
    CuNi23 0.30 <160 8.9 300 1150
    CuNi30 0.35 <100 8.9 350 1170
    CuNi34 0.40 -0 8.9 350 1180
    CuNi40 0.48 ±40 8.9 400 1280
    CuNi44 0.49 <-6 8.9 400 1280

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