Invar 36 (Invar36)
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Basic Properties
| Alloy Type | |
|---|---|
| Designation | Invar36 |
| Density | 8.05 g/cm³ |
| Melting Point | 1427°C |
Composition
| Element | Percentage |
|---|
Description
Iron-nickel alloy with extremely low coefficient of thermal expansion near room temperature.
| Density | 8.05 g/cm³ |
|---|---|
| Electrical Resistivity | 82 μΩ·cm |
| Tensile Strength | 440-540 MPa |
|---|---|
| Yield Strength | 260-340 MPa |
| Elongation | 30-45% |
| Hardness | 140-200 HB |
| Machinability | Good - machines well with standard tooling |
| Melting Point | 1427°C |
|---|---|
| Thermal Conductivity | 10.7 W/(m·K) |
| Thermal Expansion | 1.5 μm/(m·K) |
| Heat Treatment | Stress relief at 315°C, not heat treatable for strengthening |
| Heat Treatment | Stress relief at 315°C, not heat treatable for strengthening |
|---|---|
| Corrosion Resistance | Fair - iron-nickel alloys require protection from corrosion |
Applications
Precision instruments, measuring tapes, pendulum rods, bimetallic strips, clock components
History
Discovered by Charles Guillaume in 1896, earned him Nobel Prize in Physics.