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High Resistance Alloy
Iron Chrome Aluminium(Fe-Cr-Al)
Low Resistance Alloy
Ualloy-4J36 (Expansion alloy)
(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)
Ualloy-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).
Ualloy-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.
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 |
|
|
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 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 |
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 |
|
Precautions |
|
Style of supply
Alloys Name |
Type |
Dimension |
||
Ualloy-4J29 |
Wire |
D= 0.1~8mm |
||
Ualloy-4J29 |
Strip |
W= 5~250mm |
T= 0.1mm | |
Ualloy-4J29 |
Foil |
W= 10~100mm |
T= 0.01~0.1 | |
Ualloy-4J29 |
Bar |
Dia= 8~100mm |
L= 50~1000 |
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