4J29
4J29 alloy is also called Kovar alloy. The alloy has a linear expansion coefficient similar to that of borosilicate hard glass at 20-450°C, a higher Curie point, and good low-temperature structural stability.
Chemical Composition
| C % | P % | S % | Mn % | Si % | Cu % | Cr % | Mo % | Ni % | Co % | Fe % |
Min. | - | - | - | - | - | - | - | - | 28.5 | 16.8 | Bal. |
Max. | 0.03 | 0.02 | 0.02 | 0.5 | 0.3 | 0.2 | 0.2 | 0.2 | 29.5 | 17.8 |
Mechanical properties
Density (g/cm3) | 8.25 | |
Curie point (℃) | 430 | |
Resistivity (μΩ·m) | 0.48 | |
Tensile strength (MPa) | cold state | - |
annealing | 520 | |
Yield strength (MPa) | cold state | - |
annealing | 330 | |
Elongation (%) | cold state |
|
annealing | 30 | |
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