Super Invar 32-5 is a nickel-iron alloy engineered for extremely low thermal expansion, offering minimal dimensional changes across a wide range of temperatures. This makes it ideal for precision instruments, optical devices, and electronic components that require stable performance under varying thermal conditions.
Common applications of Super Invar 32-5 include scientific instruments, measuring devices, telescope components, and aerospace applications. Its reliable low expansion characteristics make it a preferred material in industries where precision and stability are critical.
| Iron, nominal | Bal |
| Nickel, nominal | 32 |
| Cobalt, nominal | 5 |
| Manganese, max | 0.6 |
| Silicon, max | 0.25 |
| Chromium, max | 0.25 |
| Carbon, max | 0.05 |
| Aluminum, max | 0.1 |
| Magnesium, max | 0.1 |
| Zirconium, max | 0.1 |
| Titanium, max | 0.1 |
| Phosphorus, max | 0.015 |
| Sulfur, max | 0.015 |
| Density | lb/cu in | 0.294 |
| Specific Gravity | 8.15 | |
| Curie Temp | °F | 500 |
| °C | 260 | |
| Poisson’s Ratio | 0.23 | |
| Electrical Resistivity (73°C) | ohm-cir mil/ft | 481.3 |
| microhm-cm | 80 | |
| Thermal Conductivity | BTU-in/sq. ft-hr-°F | 72.6 |
| W/m-°C | 10 | |
| Specific Heat | Cal/gm°C | 0.12 |
| Tensile Strength | ksi | 70 |
| MPa | 483 | |
| Yield Strength (0.2%) | ksi | 40 |
| MPa | 276 | |
| Elongation | % in 2″ | 40 |
| Hardness – Annealed | Rockwell B | 75 |
| Modulus of Elasticity | ksi | 21.0 x 103 |
| ASTM F1684 | UNS K93500 |
Standard product forms of Super Invar 32-5/UNS K93500 are pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire. The products are available in a wide variety of sizes. Please contact us at [email protected] for full information.
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