Invar 36, also known as Nilo 36 or Alloy 36, designated as UNS K93600 & K93601 and W.Nr. 1.3912, is a low-expansion, nickel-iron alloy that exhibits exceptionally low thermal expansion properties. This makes it ideal for applications requiring precise dimensional stability under varying temperature conditions.
Invar 36 is widely used in the manufacturing of precision instruments, clocks, measurement devices, and aerospace components, where high dimensional stability is crucial. Its resistance to thermal expansion makes it highly suitable for industries that require high accuracy over a broad temperature range.
| Carbon (C) | 0.15 % max. |
| Manganese (Mn) | 0.6 % max. |
| Silicon (Si) | 0.4 % max. |
| Phosphorus (P) | 0.025 % max. |
| Sulfur (S) | 0.025 % max. |
| Chromium (Cr) | 0.25 % max |
| Nickel (Ni) | 35.0-38.0 % |
| Cobalt (Co) | 0.5 % max. |
| Iron (Fe) | Balance |
| Density | lb/in3 | 0.293 |
| g/cm3 | 8.11 | |
| Melting point | °F | 2605 |
| °C | 1430 | |
| Inflection Point | °F | 430 |
| °C | 220 | |
| Thermal Conductivity at 20°C (68°F) | ||
| Btu•in/ft²•h•°F | 69.3 | |
| W/m•°C | 10 | |
| Electrical Resistivity 20°C (68°F) | ||
| ohm•circ mil/ft | 481 | |
| microhm-cm | 80 | |
| Expansion coefficent (10ˉ⁶/℃) | ||
| from 20°C to 100°C | 1.5 | |
| from 20°C to 150°C | 2 | |
| from 20°C to 200°C | 2.6 | |
| from 20°C to 250°C | 3.5 | |
| from 20°C to 300°C | 5.5 | |
| from 20°C to 350°C | 7.2 | |
| from 20°C to 400°C | 8.4 | |
| from 20°C to 450°C | 9.3 | |
| from 20°C to 550°C | 10.1 |
|
Form |
Temperature |
Tensile Strength |
Yield Strength |
Elongation on 50 mm (0.2 inch) |
Reduction of Area |
||
|
Mpa |
ksi |
MPa |
ksi |
% |
% |
||
|
Hot-rolled Bar |
Room Temperature |
490 |
71 |
240 |
35 |
42 |
70 |
| Sheet & Strip | ASTM B 388 |
| ASTM B 753 | |
| DIN 171 | |
| Sheet Strip & Bar | SEW 38 |
Standard product forms of Invar 36/Nilo 36/Alloy 36/UNS K93600 & K93601/W. Nr. 1.3912 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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