Cuprothal® 49 strip is an austenitic copper-nickel alloy (CuNi alloy) for use at temperatures up to 600°C (1110°F). The alloy is characterized by high electrical resistance, high ductility and good corrosion resistance.
Typical applications are:
- Electrical heating
- Temperature-stable potentiometers
- Industrial rheostats
- Electric motor starter resistances.
Chemical composition
| Ni % | Mn % | Fe % | Cu % | |
|---|---|---|---|---|
| Nominal Composition | 44.0 | 1.0 | 0.5 | Bal. |
Mechanical properties
| Thickness | Yield strength | Tensile strength | Elongation | Hardness |
|---|---|---|---|---|
| Rp0.2 | Rm | A | ||
| mm | MPa | MPa | % | Hv |
| 1 | 250 | 430 | 20 | 100-130 |
Physical properties
| Density g/cm3 | 8.9 |
|---|---|
| Electrical resistivity at 20°C Ω mm2/m | 0.49 |
| Temperature °C | 100 | 200 | 300 | 400 | 500 | 600 |
|---|---|---|---|---|---|---|
| Ct | 1.002 | 1.002 | 1.001 | 1.005 | 1.017 | 1.037 |
| Temperature °C | Thermal Expansion X10-6/K |
|---|---|
| 20-100 | 14 |
| Temperature °C | 20 |
|---|---|
| W m-1 K-1 | 21.0 |
| Temperature °C | 20 |
|---|---|
| kJ kg-1 K-1 | 0.410 |
| Melting point °C | 1280 |
|---|---|
| Max continuous operating temperature in air °C | 600 |
| Magnetic properties | The material is non-magnetic |