Super Invar 32-5
UNS K93500
Description
32-5
Super Invar 32-5 is a magnetic, austenitic, solid solution alloy with main chemical component of nickel, iron, and cobalt. The alloy was originally designed to provide minimum thermal expansion at room temperatures with the coefficient of thermal expansion (CTE) around one third of the CTE of regular Invar and its CTE is almost zero after specific heat processing. Super Invar 32-5 also has the austenite stability to service temperatures at least -67 °F. The alloy is used primarily as structural components for support and substrate in optical and laser systems requiring accurate measurements.
Chemical Component
| Ni | Co | Fe | Cu | Al | C | Cr | S | Mn | Si |
|---|---|---|---|---|---|---|---|---|---|
| 32.0% (Nominal) | 5.0% (Nominal) | Bal. | 0.08% | 0.07% | 0.5% | 0.25% | 0.015% | 0.05% | 0.08% |
Basic Information
| Items | Super Invar 32-5 |
|---|---|
| Catalog | ACMA-Ni-A004 |
| Density | 8.15 g/cm3 |
| Modulus of Elasticity at 20 °C | 145 GPa |
| Specific Heat at 20 °C | 0.12 Cal/g-°C |
| Thermal Conductivity at 20 °C | 0.10 W/cm°C |
| Thermal Expansion 25 °C to 450 °C | 8.0 ppm/°C |
| Electrical Resistivity | 82 mΩ-cm |
| Poisson's coefficient | 0.23 |
| Youngs / Shears Modulus | 59 GPa |
| Curie Temperature | 245 °C (470 °F) |
| Melting Point | 1427 °C (2600 °F) |
Material Forms
Alfa Chemistry offers Super Invar 32-5 alloy in a variety of forms, including
- Plate
- Bar
- Sheet
Mechanical Properties
| Condition | Yield Strength | Tensile Strength | Hardness | Elongation |
|---|---|---|---|---|
| Hot Rolled | 276 MPa | 483 MPa | 132 HB | 40 |
Specifications
Plate, Bar, Sheet: ASTM F1684 (CHEM ONLY), AMS 1-23011, UNS K93500
Applications
Super Invar 32-5 alloy can be used in a variety of applications, including:
- Optical instruments
- Telescopes
- Laser instruments and equipment
- Structural components and supports for optical and laser systems
- Applications that require lower expansivity than Invar
- Positioning devices
- Metrology devices
- Scientific instruments
- Ring laser gyroscopes
- Laser benches
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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