INVAR Nickel Alloy
INVAR （4J36） is a special low-expansion iron-nickel alloy with an ultra-low coefficient of thermal expansion. Among its components, the control of carbon and manganese contents is extremely important. Cold deformation can reduce the thermal expansion coefficient, and heat treatment within a specific temperature range can stabilize the thermal expansion coefficient. 4J36 has corrosion resistance in dry air at room temperature. In other harsh environments, such as humid air, corrosion may occur.
Chemical Composition
|
|
Ni |
C |
Si |
Mn |
P |
S |
Fe |
|
Min |
35 |
- |
- |
0.2 |
- |
- |
Rem |
|
Max |
37 |
0.05 |
0.3 |
0.6 |
0.02 |
0.02 |
Rem |
Material Properties
|
Density |
Melting Point |
Minimum Mechanical Properties of the Alloy at Room Temperature |
||
|
Tensile Strength |
Yield Strength |
Elongation |
||
|
g/cm3 |
℃ |
Rm N/mm2 |
Rp0.2 N/mm2 |
A5% |
|
8.1 |
1430 |
490 |
240 |
42 |
Standards
ASTM B511 ASTM B512
Feature
4J36 low expansion alloy: Low thermal expansion coefficient (-60~80°C) with good plasticity
Applications
Five tech sectors: Aerospace, electronics, instruments, energy, medical devices
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