CuNi44 Copper Nickel Resistance Wire (Constantan Alloy) for Precision Resistors
CuNi44 alloy (also known as Constantan, Alloy 300, Cuprothal 294, Cupron) is a copper-nickel resistance alloy with 44% nickel content. It features an extremely low temperature coefficient of resistance (TCR), making it ideally suited for precision resistors, shunts, thermocouple extension wires, and low-temperature heating applications.
Our CuNi44 wire offers excellent resistance consistency, good weldability, and long-term stability. It is widely used in electrical instruments, automotive sensors, aerospace control systems, and laboratory equipment.
We can supply round wire, flat wire, and ribbon/strip in various diameters and tolerances
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
|
Applications:
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Precision wirewound resistors and shunts
-
Thermocouple extension wire (Type S, R, B - compensating conductors)
-
Low-voltage circuit breakers and thermal overload relays
-
Low-temperature heating elements (e.g., floor heating cables)
-
Automotive sensors and instrument shunts
-
Laboratory resistance standards
Why Choose Our CuNi44 Wire?
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Strict raw material control (virgin nickel & copper, no recycled scrap)
-
Advanced drawing and annealing process ensures uniform resistivity and smooth surface
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±0.005 mm tolerance available for precision applications
-
RoHS, REACH, SGS test report can be provided
-
Short lead time: 15-20 days for bulk orders
Contact us for a free quote or sample request.
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