NiMn2 is a nickel/manganese grade designed for use at temperatures up to 1000°C. This grade of material is commonly used for electrical resistor terminations.
The addition of Mn to pure nickel brings much improved resistance to sulphur attack at elevated temperatures and improves strength and hardness, without appreciable reduction of ductility.
Mechanical properties
| Yield strength | Tensile strength | Elongation |
|---|---|---|
| Rp0.2 | Rm | |
| MPa | MPa | % |
| 230 | 440 | 35 |
Physical properties
| Density g/cm3 | 8.81 |
|---|---|
| Electrical resistivity at 20°C, Ω mm2/m (Ω cmf) | ≤0.11 (66) |
| Temperature °C | Thermal Expansion x 10-6/ K |
|---|---|
| 20 - 100 | 13 |
| Temperature °C | 100 |
|---|---|
| W m-1 K-1 | 41 |
| Temperature, °C | 20 |
|---|---|
| kJ kg-1 K-1 | 0.46 |
| Melting point, °C | 1435 |
|---|---|
| Magnetic properties | The material is slightly magnetic. |