Alloy 36 (Invar®) is a nickel-iron alloy containing approximately 36% nickel and balance iron. It is known for its exceptionally low coefficient of thermal expansion up to 400°F (204°C), making it an ideal material for precision components, glass-to-metal sealing applications, and electronic assemblies requiring dimensional stability. We manufacture Alloy 36 strip and wire to ASTM F30 requirements for demanding electronic and industrial applications.
Why Is Alloy 36 Used for Controlled Thermal Expansion?
Alloy 36 minimizes dimensional changes caused by temperature fluctuations. It’s extremely low thermal expansion helps prevent stress between dissimilar materials, supporting long-term reliability in hermetic sealing, instrumentation, and precision electronic applications.
What Is the Chemical Composition of Alloy 36?
| Element |
Composition |
| Nickel (Ni) |
36.0% |
| Manganese (Mn) |
0.1% |
| Carbon (C) |
0.005% |
| Iron (Fe) |
Balance |
What Are the Physical and Mechanical Properties of Alloy 36?
| Property |
Value |
| Density |
0.291 lb/in3 |
| Specific Gravity |
8.05 |
| Tensile Strength |
65,000 psi |
| Yield Strength |
38,000 psi |
| Elongation |
35% |
| Hardness |
130 HV |
| Elastic Modulus |
20.5 × 106 psi |
What Are the Thermal Expansion Properties of Alloy 36?
| Temperature Range |
Coefficient |
| 30-300°C / 86-572°F |
5.5 × 10-6 m/m/°C |
| 30-400°C / 86-752°F |
8.4 × 10-6 m/m/°C |
Where Is Alloy 36 Used?
- Hermetic electronic packages
- Precision instruments
- Electronic lead frames
- Sensors and controls
- Glass-to-metal seals
- Dimensional stability applications