FeNi36 Thermal Expansion Alloy
FeNi36, also known as Invar 36, is a nickel-iron alloy with an extremely low coefficient of thermal expansion, making it ideal for applications that require dimensional stability across a wide temperature range. The alloy’s thermal expansion properties can be further adjusted through cold working, while heat treatment within specific temperature ranges helps maintain stability.
To ensure consistent performance, the composition of FeNi36 is carefully controlled, particularly in terms of carbon and manganese content. While it exhibits good corrosion resistance in dry air at room temperature, exposure to humid or aggressive environments may lead to oxidation or rust formation. FeNi36 supports various welding techniques, including TIG welding (Tungsten Inert Gas), metal arc welding, plasma arc welding, argon arc welding, and manual arc welding. For optimal results, pulse arc welding is recommended.
Applications- Production, storage, and transportation of liquefied gases
- Measurement and control instruments operating below 200°C, such as temperature regulation devices
- Threaded connector bushings for joints between metals and other materials
- Bimetallic components used in temperature control systems
- Membrane frames for precision applications
- Shadow masks for display and imaging technologies
- Tempering molds for CRP components in the aerospace industry
- Structural frames for electronic control units in satellites and missiles operating below -200°C
- Support electrodes in electromagnetic lenses for laser control devices
| Grade | C | Si | Mn | P | S | Ni | Fe | Cr | Co | |
| 4J36 | ≤0.03 | ≤0.01 | 0.3-0.6 | ≤0.02 | ≤0.01 | 35-37 | Bal. | ≤0.2 | ≤0.5 |
| Density (g/cm3) | 8.1g/cm3 |
| Curie point, Tc/ ℃ | 230℃ |
| Melting point | 1430℃ |
| Specific heat | 515J/Kg |
| Yield Rp0.2 | ≥274 MPa |
| Tensile strength (Rm) | ≥957 MPa |
| Elongation | >40% |
| Brinell hardness (HBW) | >422HBW |
| Temperature coefficient(20-100℃) | 1.2 × 10–6 K–1(1.2 ppm°C) |
Fe-Ni36, W.Nr.1.3912, Ni36, Vacodil36, Nilo 36, X1NiCrMoCu, N 5-20-7, 4J36, UNSK93600, UNSK93601
