FeNi42
FeNi42 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
| Composition | % | Fe | Ni | Mn | C | P | S | Si | Al |
|---|---|---|---|---|---|---|---|---|---|
| content | min | Bal | 41.5 | - | - | - | - | - | - |
| content | max | Bal | 42.5 | 0.8 | 0.05 | 0.02 | 0.02 | 0.3 | 0.1 |
Physical and chemical properties
| Property Name | Value |
|---|---|
| Density (g/cm3) | 8.12 |
| Electrical resistivity at 20ºC(mm2/m) | 0.61 |
| Hardness(HV) | 135 |
| Thermal conductivity, λ/ W/(m*ºC) | 14.6 |
| Curie point Tc/ ºC | 360 |
| Elastic Modulus, E/ Gpa | 147 |
| Melting point ºC | 1430 |
Main purpose:
mainly used for soft glass and ceramic sealing, Make electronic tubes, transistors and integrated circuit leads, Frame and seal plug.
Supply status
There are rods, tube, rods, strip and wire.
Coefficient of expansion
| θ/ºC | α1/10-6ºC-1 | θ/ºC | α1/10-6ºC-1 |
|---|---|---|---|
| 20~100 | 5.6 | 20~400 | 5.9 |
| 20~200 | 4.9 | 20~450 | 6.9 |
| 20~300 | 4.8 | 20~500 | 7.8 |
| 20~350 | 4.95 | 20~600 | 9.2 |
Typical Mechanical properties
| Tensile Strength | Elongation |
|---|---|
| Mpa | % |
| 490 | 35 |
The heat treatment process
| Annealing | Heated to 900 ±20ºC in a hydrogen atmosphere |
|---|---|
| Holding time, h | 1 hour |
| Cooling | With speed not more than 5 ºC / min. cooling to below 200 ºC |