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Bright Invar 36 Strip (0.2mmx110mm) for Radio Element

Basic Info

Model No.:  OhmAlloy-4J36

Product Description

Model NO.: OhmAlloy-4J36 Material: Feni Alloy PCD: 0~100 Hole: 0 Width: 10-250mm Magnetic Properties: Less Than 230 Celsius Is Ferromagnetic. Weight Coil: 10~50 Kg Transport Package: Coil+ Waterproof Paper+ Wooden Case HS Code: 722699900 Product Type: Strip Carbon Content: Low Carbon ET: 0~100 Thickness: 0.05~5mm Condition: Bright Surface, Soft Heat Treatment: Done Trademark: OhmAlloy-4J36 Specification: SGS 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).
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.

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

Density (g/cm3)
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

Coefficient of expansion
θ/ºC α1/10-6ºC-1 θ/ºC α1/10-6ºC-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

Typical Mechanical properties

Tensile Strength
Mpa %
641 14
689 9
731 8
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.


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

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
Good luck to you!

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