4J34
4J34 is a nickel-iron alloy, also known as Invar 36 alloy. It has an extremely low thermal expansion coefficient and is an important material in high-precision instruments, optical devices, antennas, satellites and other fields.
Chemical Composition
| C % | P % | S % | Mn % | Si % | Ni % | Co % | Fe % |
Min. | - | - | - | - | - | 28.5 | 19.5 | Bal. |
Max. | 0.05 | 0.02 | 0.02 | 0.5 | 0.3 | 29.5 | 20.5 |
Mechanical properties
| Status | Tensile strength (MPa) |
Wire | soft state | <585 |
hard state | >860 | |
Strip | soft state | <540 |
hard state | >700 |
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