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OhmAlloy-4J33 (Expansion alloy)
(Common Name: 33НК, 4J33, KV-4, Ni33Co17)
4J33 alloy has a close Linear expansion coefficient with 95% Al2O3 ceramic in the range of -60 to 600 degrees Celsius. it is an Important sealing structural material in the electric vacuum industry; Mainly used for matching and ceramic sealing.
| Ni | 32.0~33.6 | Fe | Bal. | Co | 14.0~15.2 | Si | ≤0.3 |
| Mo | - | Cu | - | Cr | - | Mn | ≤0.5 |
| C | ≤0.05 | P | ≤0.02 | S | ≤0.02 |
| Density (g/cm3) | 8.27 |
| Electrical resistivity at 20℃(Ωmm2/m) | 0.46 |
| Thermal conductivity, λ/ W/(m*℃) | 17.6 |
| Curie point Tc/ ℃ | 440 |
| Elastic Modulus, E/ Gpa | 139 |
Coefficient of expansion
| θ/℃ | α1/10-6℃-1 | θ/℃ | α1/10-6℃-1 |
| 20~300 | 6.3 | 20~400 | 6.1 |
| 20~500 | 6.9 | 20~600 | 8.3 |
| Tensile Strength | Elongation |
| Mpa | % |
| 539 | 32 |
| The heat treatment process | |
| Stress relief annealing | Heating to 470~540℃. Keep 1~2h, cooling in the air |
| Annealing | Heating to 750~ 900℃ In the medium vacuum |
| Holding time, h | 15min. ~ 1 hour |
| cooling | In the air |
Style of suppDly
| Alloys Name | Type | Dimension | ||
| OhmAlloy-4J33 | Wire | D= 0.1~8 mm | ||
| OhmAlloy-4J33 | Strip | W= 5~250 mm | T= 0.1 mm | |
| OhmAlloy-4J33 | Foil | W= 10~100 mm | T= 0.01~0.1 mm | |
| OhmAlloy-4J33 | Bar | Dia= 8~100 mm | L= 50~1000 mm | |
