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HUONA-Alloy-4J36 (Expansion alloy), commonly known as Invar, FeNi36, Invar Standard, or Vacodil36, is a nickel-iron alloy renowned for its exceptionally low coefficient of thermal expansion (CTE). The name "Invar" derives from "invariable," reflecting its minimal expansion or contraction with temperature changes.
Invented in 1896 by Swiss physicist Charles Édouard Guillaume, who received the Nobel Prize in Physics in 1920 for this discovery, Invar has enabled significant advancements in scientific instruments and precision engineering.
Applications
HUONA-Alloy-4J36 (Invar) is utilized in applications requiring high dimensional stability, including:
Precision instruments and clocks
Seismic creep gauges
Television shadow-mask frames
Valves in motors
Antimagnetic watches
High-precision leveling rods in land surveying
Piston struts to limit thermal expansion in cylinders
Chemical Composition
Element
Content (%)
Element
Content (%)
Ni
35~37.0
Mn
0.2~0.6
Fe
Balance
C
≤0.05
Si
≤0.3
P
≤0.02
S
≤0.02
Physical Properties
Property
Value
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 point Tc/ ℃
230
Elastic Modulus, E/ Gpa
144
Coefficient of Thermal Expansion
Temperature Range (℃)
α1/10⁻⁶℃⁻¹
Temperature Range (℃)
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
Mechanical Properties
Tensile Strength (Mpa)
Elongation (%)
641
14
689
9
731
8
Heat Treatment Processes
Annealing for Stress Relief
Heated to 530~550℃ and hold 1~2 hours, then cool down.
Annealing
To eliminate hardening from cold-rolled or cold drawing processes. Heat to 830~880℃ in vacuum, hold for 30 minutes.
Stabilization Process
In protective media, heated to 830℃, hold 20 minutes to 1 hour, then quench
Due to stress from quenching, heat to 315℃, hold 1~4 hours
Precautions
Cannot be hardened by heat treatment
Surface treatment options: sandblasting, polishing, or pickling
Alloy can be cleaned using 25% hydrochloric acid pickling solution at 70℃ to remove oxidized surface
Available Forms
Alloy Name
Type
Dimensions
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=0.01~0.1mm
HUONA-Alloy-4J36
Bar
Dia=8~100mm, L=50~1000mm
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...