Constantan Wire CuNi44 – Low TCR Resistance Alloy Wire for Precision Resistors
Product Description
CuNi44 Constantan Resistance Alloy Wire for Precision Resistors & Thermocouples
Product Description:
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.
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