Alloy 52 is a nickel-iron alloy containing approximately 50.5% nickel. It is specifically designed for glass-to-metal sealing applications requiring highly consistent thermal expansion characteristics over a broad temperature range.
Why Is Alloy 52 Used for Glass Sealing Applications?
Alloy 52 exhibits highly stable thermal expansion up to 1049°F (565°C), making it particularly suitable for sealing specialized soft glasses used in high-reliability electronic and hermetic systems.
What Is the Chemical Composition of Alloy 52?
| Element |
Composition |
| Nickel (Ni) |
50.5% |
| Manganese (Mn) |
0.2% |
| Carbon (C) |
0.005% |
| Iron (Fe) |
Balance |
What Are the Physical and Mechanical Properties of Alloy 52?
| Property |
Value |
| Density |
0.300 lb/in3 |
| Specific Gravity |
8.30 |
| Tensile Strength |
72,000 psi |
| Yield Strength |
36,000 psi |
| Elongation |
35% |
| Hardness |
120-130 HV |
| Elastic Modulus |
24 × 106 psi |
What Are the Thermal Expansion Properties of Alloy 52?
| Temperature Range |
Thermal Expansion |
| 30-450°C / 86-842°F |
9.7-10.2 × 10-6 m/m/°C |
| 30-550°C / 86-1022°F |
10.0-10.5 × 10-6 m/m/°C |
Where Is Alloy 52 Commonly Used?
- Glass-to-metal seals
- Electronic packages
- Electrical feedthroughs
- Sensors
- Hermetic enclosures
- High-reliability electronics