Invar Alloy
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Introduction:
The curie point of Invar alloy is about 230℃. When the temperature is lower than 230, the alloy is ferromagnetic with a very low expansion coefficient. Otherwise, the alloy is non-magnetic and the expansion coefficient increases. This Invar alloy is mainly used for manufacturing component with nearly constant size in the range of temperature variety. And it is widely used in radio industry, precision instrument, meter and other industries.
Style | Size | ||
Wire | D=0.1~8mm | ||
Strip | W= 5~250mm | T= 0.1mm | |
Foil | W= 10~100mm | T= 0.01~0.1mm | |
Rod | Dia=8~100mm | L=50~1000mm |
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 |
Density (g/cm3) | 8.1 |
Resistivity under 20℃(Ωmm2/m) | 0.78 |
Thermal conductivity, λ/ W/(m*℃) | 11 |
Curie point, Tc/ ℃ | 230 |
Elasticity modulus, E/ Gpa | 144 |
θ/℃ | α1/10-6℃-1 | θ/℃ | α1/10-6℃-1 |
20~-60 | 1.8 | 20~250 | 3.6 |
20~-40 | 1.8 | 20~300 | 5.2 |
20~-20 | 1.6 | 20~350 | 6.5 |
20~-0 | 1.6 | 20~400 | 7.8 |
20~50 | 1.1 | 20~450 | 8.9 |
20~100 | 1.4 | 20~500 | 9.7 |
20~150 | 1.9 | 20~550 | 10.4 |
20~200 | 2.5 | 20~600 | 11.0 |
Tensile Strength (Mpa) | Elongation (%) |
641 | 14 |
689 | 9 |
731 | 8 |
Temperature range, ℃ | 20~50 | 20~100 | 20~200 | 20~300 | 20~400 |
aR/ 103*℃ | 1.8 | 1.7 | 1.4 | 1.2 | 1.0 |
Stress-relief annealing | Be heated to 530~550℃ and keep warm for 1-2h. furnace cooling. |
Anneal | The workpiece is heated to 830~880℃ and be kept for 30 min. Furnace cooling. |
Stabilizing treatment | 1) it is heated to 830 ℃ in protective gas environment for 20min. Then conduct quenching for 1h. 2) annealing |
Note | 1) Alloy can not be hardened by heat treatment. 2) surface treatment can adopt sand blasting, polishing and pickling. |
Index
nickel alloy, alloy pipe
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