Inv 127 is a nickel-iron alloy (NiFe alloy) for use at temperatures up to 600°C (1110°F). The alloys has a moderate constant thermal expansion factor up to 300°C (570°F).
Typical applications for Inv 127 are in high-temperature thermostats and thermostatic bimetal.
Chemical composition
| Ni % | Fe % | |
|---|---|---|
| Nominal composition | 40.5 | Bal. |
Mechanical properties
| Yield strength | Tensile strength | Elongation | Hardness |
|---|---|---|---|
| Rp0.2 | Rm | A | |
| MPa | MPa | % | Hv |
| 270 | 460 | 30 | 125 |
Physical properties
| Density g/cm3 | 8.12 |
|---|---|
| Electrical resistivity at 20°C Ω mm2/m | 0.71 |
| Temperature °C | Thermal Expansion X10-6 /K |
|---|---|
| 30-130 | 3.8 |
| Temperature °C | 100 |
|---|---|
| W m-1 K-1 | 12.5 |
| Temperature °C | 20 |
|---|---|
| kJ kg-1 K-1 | 0.50 |
| Melting point °C | 1425 |
|---|---|
| Magnetic properties | The material is magnetic up to approximately 530°C (the Curie point). |
