# Alloy 690 UNS N06690: Properties and Applications in High-Temperature Environments
Introduction to Alloy 690 UNS N06690
Alloy 690 UNS N06690 is a nickel-chromium-iron alloy known for its excellent resistance to high-temperature oxidation and corrosion. This material is widely used in industries where extreme conditions are common, such as nuclear power plants, chemical processing, and aerospace applications. Its unique composition and mechanical properties make it a preferred choice for demanding environments.
Chemical Composition
The chemical composition of Alloy 690 plays a crucial role in its performance. The primary elements include:
- Nickel (Ni): 58-63%
- Chromium (Cr): 27-31%
- Iron (Fe): 7-11%
- Carbon (C): ≤0.05%
- Manganese (Mn): ≤0.50%
- Silicon (Si): ≤0.50%
- Copper (Cu): ≤0.50%
- Aluminum (Al): ≤0.50%
- Titanium (Ti): ≤0.50%
Mechanical Properties
Alloy 690 exhibits outstanding mechanical properties, especially in high-temperature environments:
| Property | Value |
|---|---|
| Tensile Strength | 550-690 MPa |
| Yield Strength | 240-310 MPa |
| Elongation | 30-40% |
| Hardness (Rockwell B) | 80-90 |
Key Features
Alloy 690 UNS N06690 offers several advantages that make it suitable for high-temperature applications:
- Excellent Oxidation Resistance: Performs well in environments with temperatures up to 1100°C.
- Corrosion Resistance: Resistant to stress corrosion cracking and pitting in aggressive media.
- High-Temperature Strength: Maintains structural integrity under thermal stress.
- Good Fabricability: Can be welded, machined, and formed with relative ease.
Keyword: Alloy 690 UNS N06690
Applications in High-Temperature Environments
Due to its exceptional properties, Alloy 690 is used in various industries:
- Nuclear Power Plants: Used in steam generator tubes and reactor components due to its resistance to stress corrosion cracking.
- Chemical Processing: Ideal for equipment exposed to corrosive chemicals at elevated temperatures.
- Aerospace: Employed in jet engine components and exhaust systems.
- Heat Treatment Industry: Used in furnace fixtures and heat exchangers.
Conclusion
Alloy 690 UNS N06690 is a versatile material designed to withstand extreme conditions. Its combination of high-temperature
