Copper-Nickel Alloys: Electrical ResistanceAlloy Description
Constantan: 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).
MnLow: Copper-Nickel-Manganese alloy. Used in precision electrical measuring apparatus and resistors.
30 Alloy / 15 Alloy / 10 Alloy / 5 Alloy: Copper-Nickel alloy.Lower the resistivity, lower is the temperature coefficient of resistance. Used as general resistance wires, cores of low temperature heaters, resistance elements of heaters for electrical circuit breakers/fuses.
Condition of Supply
Constantan, MnLow, 30 Alloy, 15 Alloy, 10 Alloy and 5 Alloy are available in following conditions:
- Cold Drawn, Special Temper.
- Cold Drawn, Annealed.
- Straightened and Cut Lengths.
Properties
| Specific Resistance (µ W-cm) | Density (g/cm³) | Linear Expansion Coeff. (T=20-100 °C) |
Maximum Operating Temperature of Element (°C) | |
|---|---|---|---|---|
| Constantan | 49 | 8.9 | 14 | 600 |
| MnLow | 43 | 8.41 | 18 | - |
| 30 Alloy | 30 | 8.9 | 15.7 | 400 |
| 15 Alloy | 15 | 8.9 | 16 | 400 |
| 10 Alloy | 10 | 8.9 | 16.2 | 300 |
| 5 Alloy | 5 | 8.9 | 16.4 | 300 |
Size Range
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
| Constantan | MnLow | 30 Alloy | 15 Alloy | 10 Alloy | 5 Alloy | |
|---|---|---|---|---|---|---|
| Tensile strength Min-Max (N/mm²) | 420-690 | 290-640 | 340-690 | 250-540 | 230-680 | 220-440 |
| Elongation % (Approx.: Annealed) | 25 | 25 | 25 | 25 | 25 | 25 |
Note: Other Grades of nickel-copper resistance alloys are also available. Please contact us for more information.
