48NiFe is an iron-nickel controlled expansion alloy suitable to soft glass sealing, with optimal chemical composition to obtain hermetic seals. Typical applications are hermetic feedthroughs and electron gun components.
Chemical composition
| Iron Fe Bal. | Nickel Ni 48.0% |
| Element, % | Min % | Max % |
| Ni | 48.0 | – |
| Fe | – | Balance |
Mechanical property
| Alloy State | Tensile Strength, N/mm² |
Yield Strength, N/mm² |
Elongation, % |
| Annealed | 540.00 | 270.00 | 30.00 |
| Hard | 740.00 | 710.00 | 5.00 |
Physical properties
| Density (g/cm3) |
Resistivity at 20 oC (μohm.cm) |
Melting To (oC) |
Curie To (oC) |
Specific Heat (J/g oC) |
Termal Conductivity at 20 oC (W/m/oC) |
| 8.20 | 50.0 | 1425.0 | 450.0 | 0.5 | 16.0 |
Characteristics
- Low Coefficientof thermal expansion
- High Inflection Point
- Good Magnetic Properties
Applications
- Industrial thermostat sticks
- Radio valves
- Lighting Lamps