4J42
4J42 is a glass-sealed alloy and an iron-nickel fixed expansion alloy. Its expansion coefficient and Curie point increase with the increase of nickel content. This alloy is a widely used sealing structural material in the electric vacuum industry.
Chemical Composition
| C % | P % | S % | Mn % | Si % | Al % | Co % | Ni % | Fe % |
Min. | - | - | - | - | - | - | - | 44.5 | Bal. |
Max. | 0.05 | 0.05 | 0.02 | 0.02 | 0.80 | 0.30 | 0.10 | 45.5 |
Mechanical properties
| Status | Tensile strength (MPa) |
Strip | soft state | <590 |
hard state | >700 |
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