4J36 0.3x10mm Low Expansion Alloys Heating Invar Coil Strip
4J36 0.3x10mm Expansion alloy heating coil Invar Standard coil strip
OhmAlloy-4J36 (Expansion alloy)(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)
OhmAlloy-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).
Name INVAR comes from the unchanged word, refer to its relative lack of expansion or contraction with temperature changes.
It was invented by the Swiss physicist Charles éduardguillaume in 1896. He received 1920 Nobel Physics Award in 1920, which is the discovery that improves scientific instruments.
Ohmalloy-4J36 (INVAR) is used to require high-dimensional stability, such as precision instruments, watches, seismic creep, TV shaded mask frames, valves and anti-control watches in motors. In ternary measurement, when the first order (high precision) elevation is equal, the horizontal employee (horizontal rod) used is made of INVAR, instead of wood, glass fiber or other metal. Invar Struts is used in some pistons to limit its thermal expansion within their cylinders.
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 |
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 pointTc/ ℃ | 230 |
| Elastic Modulus, E/ Gpa | 144 |
Coefficient of expansion
| 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 |
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Typical Mechanical properties
| Tensile Strength | Elongation |
| Mpa | % |
| 641 | 14 |
| 689 | 9 |
| 731 | 8 |
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 |
The heat treatment process
| Annealing for stress relief | Heated to 530~550℃ and hold 1~2 h. Cold down |
| annealing | In order to eliminate hardening, which be bring out in cold-rolled, cold drawing process. Annealing needs heated to 830~880℃in vacuum, hold 30 min. |
| The stabilization process |
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| Precautions |
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Style of supply
| Alloys Name | Type | Dimension | |
| OhmAlloy-4J36 | Wire | D=0.1~8mm | |
| OhmAlloy-4J36 | Strip | W= 5~250mm | T= 0.1mm |
| OhmAlloy-4J36 | Foil | W= 10~100mm | T= 0.01~0.1 |
| OhmAlloy-4J36 | Bar | Dia=8~100mm | L=50~1000 |
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