CuNi44 Copper Nickel Resistance Wire 0.49 Ohm mm2/m for Precision Resistors and Low TCR Applications
Product Description
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:
-
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?
-
Strict raw material control (virgin nickel & copper, no recycled scrap)
-
Advanced drawing and annealing process ensures uniform resistivity and smooth surface
-
±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.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.