FeNi54 Iron nickel constant expansion glass sealed alloy wire
Iron nickel alloy is obtained at a given temperature range by
adjusting the content of nickel internal energy and the expansion
coefficient of different soft glass and ceramic matching a series
of expansion alloy,
its expansion coefficient and the Curie temperature increases with
the increase of nickel content.The assembly is widely used in
electric vacuum industry the sealing structure of the material
Chemical Composition in %,
| brand | Chemical composition |
| Ni | Fe | C | P | Si | Co | Mn | Al | S |
| ≤ |
| 4j42 | 41.5~42.5 | Bal | 0.05 | 0.02 | 0.3 | - | 0.80 | 0.10 | 0.02 |
| 4j45 | 44.5~45.5 | Bal | 0.05 | 0.02 | 0.3 | - | 0.80 | 0.10 | 0.02 |
| 4j50 | 49.5~50.5 | Bal | 0.05 | 0.02 | 0.3 | 1.0 | 0.80 | 0.10 | 0.02 |
| 4j52 | 51.5~52.5 | Bal | 0.05 | 0.02 | 0.3 | - | 0.60 | - | 0.02 |
| 4j54 | 53.5~54.5 | Bal | 0.05 | 0.02 | 0.3 | - | 0.60 | - | 0.02 |
Basic physical constants and mechanical properties of the alloy:
| brand | Thermal conductivity | Specific heat capacity | Density | Electric resistivity | Curie point |
| 4j54 | 18.8 | 502J | 8.28 | 0.42 | 530 |
| Typical expansion character(10 -6 / ºC ) |
| Temperature range | 20~100 | 20~200 | 20~300 | 20~350 | 20~400 | 20~450 | 20~500 | 20~600 |
| Expansion coefficient | 10.7 | 12.7 | 10.7 | 10.7 | 10.8 | 10.3 | 10.8 | 11.2 |
4 j54 alloy is mainly used for and mica, soft sealing glass
They are typically used for making:
1. various transformers which are used in moderate magnetic field,
2. relays,
3. electromagnetic clutches,
4. Chokes,
5. pole pieces,
6. earphone capsules,
7. gas safety valves,
8. magnetic shields,
9. gyroscopes,
10. selsyn motors,
11. micro motors for electronic watches,
12. earth leakage circuit breakers,
13. relay parts for earth leakage circuit-breakers,
14. cores for magnetic circuit parts.
