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High Quality Low Expansion Ferro Nickel Alloy FeNi36 /4J36 Round Rods Invar 36 Bar
1 . Description
4J36 (Invar), also known generically as FeNi36 (64FeNi in the US), is a nickel–iron alloy notable for its uniquely low coefficient of thermal expansion (CTE or α).
4J36 (Invar) is used where high dimensional stability is required, such as precision instruments, clocks, seismic creep gauges, television shadow-mask frames, valves in motors, and antimagnetic watches. In land surveying, when first-order (high-precision) elevation leveling is to be performed, the Level staff (leveling rod) used is made of Invar, instead of wood, fiberglass, or other metals. Invar struts were used in some pistons to limit their thermal expansion inside their cylinders.
2 . Normal composition%
Ni | 35~37.0 | Fe | Bal. | Co | - | Si | ≤0.3 |
Mo | - | Cu | - | Cr | - | Mn | 0.2~0.6 |
C | ≤0.05 | P | ≤0.02 | S | ≤0.02 |
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3 . Typical Physical properties
Density (g/cm3) | 8.1 |
Electrical resistivity at 20℃(Ωmm2/m) | 0.78 |
Temperature factor of resistivity(20℃~200℃)X10-6/℃ | 3.7~3.9 |
Thermal conductivity, λ/ W/(m*℃) | 11 |
Curie point Tc/ ℃ | 230 |
Elastic Modulus, E/ Gpa | 144 |
4 . Temperature factor of resistivity
Temperature range, ℃ | 20~50 | 20~100 | 20~200 | 20~300 | 20~400 |
aR/ 103 *℃ | 1.8 | 1.7 | 1.4 | 1.2 | 1.0 |
5 . Pictures
