42NiFe is an iron-nickel controlled expansion alloy suitable to glass sealing, with optimal chemical composition to obtain hermetic seals. Typical applications are integrated circuit lead frames, electron gun components, enamelled resistor ferrules and moulds for composite parts.
42NiFe shows almost negligible expansion up to 300°C and possesses large value of magnetic permeability. It is extensively utilized in the aerospace industries and manufacturing thermostat rods.
Chemical Composition
| Iron Fe Bal. | Nickel Ni 42.0% |
Mechanical Property
| Alloy State | Tensile Strength, N/mm² |
Yield Strength, N/mm² |
Elongation, % |
| Wire | 490.00 | 250.00 | 43.00 |
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) |
| 8.15 | 63.0 | 1425.0 | 330.0 | 0.5 | 12.5 |
Characteristics
- Lower thermal expansion
- Good magnetic permeability
Applications
- Lead cables
- Electronic operations
- Glass sealing and vacuum equipments