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BYP16 (4J32) is a kind of iron-nickel-cobalt alloy with a low linear expansion coefficient in the range of 20℃~100℃. This product is suitable for the production of high-precision instrument parts with constant size. Similar alloy's names in different trademark systems:
Beiye | China Standard | America | France | Japan |
BYP16 | 4J32 | Super-Invar Super-Nilvar | Invar Superieur | Super invariant steel SI |
Instrumentation devices
Geodetic surveying
Standard reticle
Framework of astronomical instruments
Verge ring
| Ni | 31.5～33.0 | Co | 3.2～4.2 |
| Mn | 0.20～0.60 | Cu | 0.40～0.80 |
Fe | bal. |
| 25℃-100℃ | ≤1.0 (α, 10-6℃-1) |
Density | 8.13 g/cm3 (0.294 lb/in3) | |
Melting Point | 1430 ℃ (2606 ℉) | |
Resistivity | 77 µΩ•cm | |
Thermal conduction | 13 W/K | |
| Elastic modulus | 141GPa | |
