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BYP19 (4J36) is a kind of iron-nickel alloy with a low linear expansion coefficients in the range of 20℃~100℃. This product is suitable for the production of the instruments and devices with constant size in a certain temperature range. Similar alloy's names in different trademark systems:
Beiye | China Standard | America | Germany | France | Japan |
BYP19 | 4J36 | Invar Nilvar Unispan36 | Vacodil36 Nilo36 | Invar Standard | Invar |
Precision balance scale
Standard frequency generator
Vane and studdle of variodencer
Passive layer of thermal bimetals
Space compensation parts of cylinder piston
Storage tank of liquid hydrogen, natural gas et al.
Vacuum device, getter cup in electron tubes, insulation support, baffle
| Ni | 35.0～37.0 | Mn | 0.20～0.60 |
Cu | 0.40～0.80 | Fe | bal. |
| 25℃-100℃ | ≤1.5 (α, 10-6℃-1) |
Density | 8.12 g/cm3 (0.293 lb/in3) | |
Melting Point | 1430~1450 ℃ (2606~2642 ℉) | |
Resistivity | 78 µΩ•cm | |
Thermal conduction | 11~13 W/K | |
| Elastic modulus | 134GPa | |
