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OhmAlloy-4J50 (Expansion alloy)
(Common Name: 50H, N50, Vacovit 500, FeNi50)
4J50 alloy is mainly composed of iron, nickel elements. It is characterized with a fixed coefficient of expansion. Increase the thermal expansion coefficient and the Curie point with increase of nickel content.
4J50 alloy is widely used the structure of the sealing material in the electric vacuum industry.
| Ni | 49.5~50.5 | Fe | Bal. | Co | 1.0 | Si | ≤0.3 |
| Mo | - | Cu | - | Cr | - | Mn | ≤0.8 |
| C | ≤0.05 | P | ≤0.02 | S | ≤0.02 | Al | ≤0.1 |
| Density (g/cm3) | 8.21 |
| Electrical resistivity at 20℃(Ωmm2/m) | 0.44 |
| Thermal conductivity, λ/ W/(m*℃) | 16.7 |
| Curie point Tc/ ℃ | 500 |
| Elastic Modulus, E/ Gpa | 158 |
Coefficient of expansion
| θ/℃ | α1/10-6℃-1 | θ/℃ | α1/10-6℃-1 |
| 20~100 | 9.8 | 20~400 | 9.4 |
| 20~200 | 9.8 | 20~450 | 9.4 |
| 20~300 | 9.5 | 20~500 | 9.7 |
| 20~350 | 9.4 | 20~600 | 10.6 |
| Tensile Strength | Elongation |
| Mpa | % |
| 490 | 35 |
| The heat treatment process | |
| Annealing | Heated to 900 ±20℃ in a hydrogen atmosphere |
| Holding time, h | 1 hour |
| cooling | With speed not more than 5 ℃ / min. cooling to below 200 ℃ |
Style of supply
| Alloys Name | Type | Dimension | ||
| OhmAlloy-4J50 | Wire | D= 0.1~8mm | ||
| OhmAlloy-4J50 | Strip | W= 5~250mm | T= 0.1mm | |
| OhmAlloy-4J50 | Foil | W= 10~100mm | T= 0.01~0.1 | |
| OhmAlloy-4J50 | Bar | Dia= 8~100mm | L= 50~1000 | |