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thermal expansion invar
Ohmalloy Material Co.,Ltd is a high-tech enterprise which specialized in making all kinds of alloy such as high resistance alloy, low-resistance copper nickel alloy, precision alloy, FeCrAl alloy and thermocouple Alloy.
Ohmalloy Material Co.,Ltd have a full production line from melting, surface cleaning, rolling and slitting, full set of testing machine and can meet all kinds of technical requirement from customer. Our product is widely used in heating equipment, big steel mill, mineral, electrical equipment, food machinery, auto industry, aerospace industry. Our product not only is popular in domestic market, but also been exported to all over the world.
Our company aims to be the best-quality alloy producer in the world. We insist on developing the more advanced alloy strip technology, to serve all the customer, improve people’s living level, make a more green earth in the future
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).
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.
OhmAlloy-4J36 use oxyacetylene welding, electric arc welding, welding and other welding methods. Since the coefficient of expansion and chemical composition of the alloy is related should be avoided due to welding causes a change in the alloy composition, it is preferable to use Argon arc welding welding filler metals preferably contains 0.5% to 1.5% titanium, in order to reduce weld porosity and crack.
|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|
Coefficient of expansion
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|
Style of supply
|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|
Contact Person: Mr. Qiu