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4J40 is a kind of iron-nickel-cobalt alloy with a low linear expansion coefficient. This product is suitable for the production of high-precision instrument parts with constant size.
| Ni | 32.4～33.4 |
Co | 7.0～8.0 |
Fe | bal. |
| 25℃-100℃ | ≤2.0 (α, 10-6℃-1) |
