Invar 36 (FeNi36) / 1.3912
Invar 36® is a nickel-iron, low expansion alloy that contains 36% nickel and possesses a rate of thermal expansion approximately one-tenth that of carbon steel. Alloy 36 maintains nearly constant dimensions over the range of normal atmospheric temperatures, and has a low coefficient of expansion from cryogenic temperatures to about 500°F. This nickel iron alloy is tough, versatile and retains good strength at cryogenic temperatures.
Material Data Sheet
| ASTM | F1684 |
|---|---|
| UNS | K93603 |
Main fields of application
Invar 36 is used mainly for:
Aircraft controls
Optical & laser systems
Radio & electronic devices
Composite forming tools & dies
Cryogenic components
Chemical composition of Invar 36
| Ni | C | Si | Mn | S |
|---|---|---|---|---|
| 35.5 - 36.5 | 0.01 max | 0.2 max | 0.2 - 0.4 | 0.002 max |
| P | Cr | Co | Fe | |
| 0.07 max | 0.15 max | 0.5 max | Balance |
Mechanical properties of Invar 36
| Metallurgical Condition | Annealed, Descaled | |
|---|---|---|
| Yield Strength | KSI (MPa) 38 | (260) Max |
| Tensile Strength | KSI (MPa) 63 | (430) Max |
| Hardness | HB | 135 |
| Elongation | 50mm | >30% (Typical 40%) |