Super Invar 32-5 is a low expansion alloy consisting of 32% Nickel, 5% Cobalt, and balance Iron. Super Invar Alloy exhibits minimum thermal expansion at room temperatures (one half of Invar Alloy), as well as thermal expansion properties less than that of Invar Alloy in the 67/203°F (-55/95°C) temperature range.
The minimal expansion of Super Invar over this range of temperatures, makes this alloy useful in many applications including structural components and substrates in instrument systems requiring precision measurements.
The chemical composition of invar 32-5 is outlined in the following table.
| Elements | Content (%) |
|---|---|
| Iron, Fe | 62 |
| Nickel, Ni | 32 |
| Cobalt, Co | 5.5 |
| Manganese, Mn | 0.4 |
| Silicon, Si | 0.25 |
The following table shows the physical properties of Invar 32-5.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.14 g/cm³ | 0.294 lb/in³ |
| Melting point | 1455°C | 2650°F |
The mechanical properties of Invar 32-5 are given in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 483 MPa | 70000 psi |
| Yield strength | 276 MPa | 40000 psi |
| Modulus of elasticity | 145 GPa | 21000 ksi |
| Poisson’s ratio | 0.23 | 0.23 |
| Elongation at break (in 2 in. (50.8 mm)) | 40% | 40% |
| Hardness, Rockwell B (annealed) | 75 | 75 |
| Hardness, Rockwell B (cold worked) | 90 | 90 |
| Machinability | 25 | 25 |
The thermal properties of Invar 32-5 are displayed in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@ -55 – 95°C/-67to -203°F) | 0.630 µm/m°C | 0.350 µin/in°F |
Super Invar Rod: 0.50" – 3.50"
Super Invar Sheet: 0.039" – 0.118"
Super Invar Plate: 0.50" – 2.50"
Optical instruments . Telescopes . Laser instruments and equipment . Ring laser gyroscopes . Laser benches . Positioning devices . Metrology devices . Structural components . Substrates in instrument systems requiring precision measurements
Our INVAR 32-5 is carefully handled to minimize damage during storage and transportation and to preserve the quality of the product in its original condition.
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