# UNS N07090 Nickel Alloy Properties and Applications
Keyword: uns n07090
## Introduction to UNS N07090 Nickel Alloy
UNS N07090 is a high-performance nickel-based alloy known for its exceptional strength, corrosion resistance, and high-temperature stability. This alloy belongs to the family of superalloys, which are specifically designed to withstand extreme environments while maintaining their mechanical properties.
## Chemical Composition of UNS N07090
The chemical composition of UNS N07090 plays a crucial role in determining its properties:
Nickel (Ni): 50-55%
Chromium (Cr): 19-21%
Cobalt (Co): 15-21%
Molybdenum (Mo): 3-5%
Titanium (Ti): 2.5-3.5%
Aluminum (Al): 1.2-1.6%
Iron (Fe): ≤5%
Carbon (C): ≤0.08%
## Mechanical Properties of UNS N07090
Room Temperature Properties
Tensile Strength: 1200-1400 MPa
Yield Strength: 800-1000 MPa
Elongation: 15-25%
Hardness: 30-40 HRC
High Temperature Properties
Retains approximately 80% of its room temperature strength at 700°C (1292°F)
Excellent creep resistance at elevated temperatures
Good fatigue resistance under cyclic loading conditions
## Physical Properties of UNS N07090
Density: 8.19 g/cm³
Melting Point: 1330-1360°C (2426-2480°F)
Thermal Expansion Coefficient: 12.5 × 10⁻⁶/°C (20-1000°C)
Thermal Conductivity: 11.4 W/m·K at 20°C
Electrical Resistivity: 1.25 μΩ·m at 20°C
## Corrosion Resistance
UNS N07090 exhibits excellent corrosion resistance in various environments:
Oxidation Resistance
Forms a protective chromium oxide layer at high temperatures
Resistant to oxidation up to 1100°C (2012°F) in air
Chemical Resistance
Excellent resistance to sulfuric, hydrochloric, and phosphoric acids
Good resistance to saltwater and marine environments
Resistant to stress corrosion cracking in chloride environments
## Heat Treatment of UNS N07090
Solution Annealing
Typically performed at 1080-1120°C (1976-2048°F)
Followed by rapid cooling (water quenching or air cooling)
Aging Treatment
Carried out at 700-800°C (1292-1472°F) for 8-16 hours
Precipitation hardening enhances mechanical properties
## Fabrication and Processing
Machining
Requires rigid machine setups and sharp tools
Recommended to use carbide tools with positive rake angles
Slow speeds and heavy feeds are generally more effective
Welding
Can be welded using gas tungsten arc welding (GTAW) and electron