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Brand Name : | BLM |
Model Number : | invar 36 |
Certification : | ISO |
Price : | Negtation |
Payment Terms : | T/T |
Supply Ability : | 5 tons per month |
Delivery Time : | 25days |
Invar36 Nilo 36 36h Sheet 34X250X500mm For OLED
1 . Description:
The name Invar comes from the word invariable, referring to its
relative lack of expansion or contraction with temperature changes.
It was invented in 1896 by Swiss physicist Charles Édouard
Guillaume. He received the Nobel Prize in Physics in 1920 for this
discovery, which enabled improvements in scientific instruments.
OhmAlloy-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%
| 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
| 8.1 |
Electrical resistivity at 20ºC(mm2/m) | 0.78 |
Temperature factor of resistivity(20ºC~200ºC)X10-6/ºC | 3.7~3.9 |
Thermal conductivity, λ/ W/(m*ºC) | 11 |
Curie point Tc/ ºC | 230 |
Elastic Modulus, E/ Gpa | 144 |
3 . Application
in radio and electronic devices,
manufacture parts in aircraft controls
optical and laser system
in bimetallic thermostats and in rod and tube assemblies for
temperature regulators
4 . Typical Mechanical properties
| Elongation |
Mpa | % |
641 | 14 |
689 | 9 |
731 | 8 |
5 . Temperature factor of resistivity
Temperature range, ºC | 20~50 | 20~100 | 20~200 | 20~300 | 20~400 |
aR/ 103 *ºC | 1.8 | 1.7 | 1.4 | 1.2 | 1.0 |
The heat treatment process | |
Annealing for stress relief | Heated to 530~550ºC 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 830~880ºC in vacuum,hold 30 min. |
The stabilization process | In protective media and heated to 830 ºC, hold 20min. ~ 1h, quench Due to the stress generated by quenching, heated to 315ºC,hold 1~4h. |
Precautions | Can not be hardened by heat treatment Surface treatment can be sandblasting, polishing or pickling. Alloy can be used 25% hydrochloric acid pickling solution at 70 ºC to clear oxidized surface |
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