Constantan: A Copper-Nickel Alloy
Alloy Description
Constantan (CuNi 44 Alloy): A Copper-Nickel alloy. High specific resistance alloy used in wire-wound precision resistors, potentiometers, volume control devices, winding heavy-duty industrial rheostats and electric motor resistances.
Also used as thermocouple alloy with Copper (Type T), Iron (Type J), and Ni-Cr (Type E). It is available with grade wires and extension wires.
Condition of Supply
Constantan (CuNi 44 Alloy) is supplied in the following conditions:
- Cold Drawn, Special Temper.
- Cold Drawn, Annealed.
- Straightened and Cut Lengths.
| Alloy | Ni% | Mn% | Fe% | Cu% |
|---|---|---|---|---|
| CuNi 44 Alloy | Min 43.0 | Max 1.0 | Max 1.0 | Bal. |
Properties
Size Range
|
Specific Resistance (µ Ω-cm) |
Density (g/cm³) |
Linear Expansion Coeff. (T=20-100 °C) |
Maximum Operating Temperature of Element (°C) |
Temperature Coeff of resistance (/°C) Temp range 20-100°C |
|---|---|---|---|---|
| 49 | 8.9 | 14 | 600 | + 20/ + 60 |
Wire: 12.0 mm diameter to 0.15mm diameter.
Strip: Width 0.4-80 mm, Thickness: 0.10 and above.
Or as per specified resistance.
Typical Tensile Strength
Strip: Width 0.4-80 mm, Thickness: 0.10 and above.
Or as per specified resistance.
| Alloy | Constantan |
|---|---|
|
Tensile strength Min-Max (N/mm²) |
420-520 |
|
Elongation % (Approx.: Annealed) |
25 |
Note: Other Grades of nickel-copper resistance alloys are also available. Please contact us for more information.