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HUONA-Alloy-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.
HUONA-Alloy-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%
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
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
In protective media and heated to 830 ℃, hold 20min. ~ 1h, quench
Due to the stress generated by quenching, heated to 315℃,hold 1~4h.
Precautions
Cannot be hardened by heat treatment
Surface treatment can be sandblasting, polishing or pickling.
Alloy can be used 25% hydrochloric acid pickling solution at 70 ℃ to clear oxidized surface
Style of supply
Alloys Name
Type
Dimension
HUONA-Alloy-4J36
Wire
D=0.1~8mm
HUONA-Alloy-4J36
Strip
W= 5~250mm
T= 0.1mm
HUONA-Alloy-4J36
Foil
W= 10~100mm
T= 0.01~0.1
HUONA-Alloy-4J36
Bar
Dia=8~100mm
L=50~1000
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Year Established:
2008
Total Annual:
8000000-100000000
Employee Number:
100~120
Ecer Certification：
Verified Supplier
Huona (Shanghai) New Material Co., Ltd. Was established in 2008, currently have three divisions: Magnesium Division, Thermal Spray Division and Functional Material Division.Magnesium Division produces magnesium metal products. Various models of high-quality magnesium alloy plate, magnesium rods, hig... Huona (Shanghai) New Material Co., Ltd. Was established in 2008, currently have three divisions: Magnesium Division, Thermal Spray Division and Functional Material Division.Magnesium Division produces magnesium metal products. Various models of high-quality magnesium alloy plate, magnesium rods, hig...
