# UNS N07090: Properties and Applications in High-Temperature Alloys
## Introduction to UNS N07090
UNS N07090 is a nickel-based superalloy known for its exceptional high-temperature strength and corrosion resistance. This alloy belongs to a family of materials specifically designed to withstand extreme environments, making it a popular choice in industries where performance under stress and heat is critical.
## Chemical Composition
The chemical composition of UNS N07090 plays a significant role in its performance characteristics:
– Nickel (Ni): 55-60%
– Chromium (Cr): 19-21%
– Cobalt (Co): 15-21%
– Molybdenum (Mo): 3-5%
– Titanium (Ti): 2.5-3.5%
– Aluminum (Al): 1.0-1.8%
– Iron (Fe): ≤2.0%
– Carbon (C): ≤0.10%
This carefully balanced composition contributes to the alloy’s unique properties and performance in high-temperature applications.
## Mechanical Properties
UNS N07090 exhibits impressive mechanical properties that make it suitable for demanding applications:
Property | Value
Tensile Strength | 1200-1400 MPa
Yield Strength | 800-1000 MPa
Elongation | 15-25%
Hardness | 30-40 HRC
These properties remain relatively stable even at elevated temperatures, which is a key advantage of this superalloy.
## Thermal Properties
The thermal characteristics of UNS N07090 contribute to its high-temperature performance:
– Melting Range: 1260-1340°C (2300-2445°F)
– Thermal Expansion Coefficient: 12.5-14.5 μm/m·°C (20-1000°C)
– Thermal Conductivity: 11-13 W/m·K (at 20°C)
These properties allow the alloy to maintain structural integrity in high-heat environments while resisting thermal fatigue.
## Corrosion Resistance
UNS N07090 demonstrates excellent resistance to various forms of corrosion:
– Oxidation resistance up to 1100°C (2012°F)
– Good resistance to carburization and nitridation
– Resistance to sulfur-containing environments
– Moderate resistance to chloride-induced stress corrosion cracking
This corrosion resistance makes it suitable for applications in chemically aggressive environments.
## Applications in Industry
The unique combination of properties makes UNS N07090 valuable in several critical industries:
### Aerospace Applications
– Turbine blades and vanes
– Combustion chamber components
– Afterburner parts
– Rocket engine components
### Power Generation
– Gas turbine components
– Heat exchangers
– Steam turbine parts
– Nuclear reactor components
### Industrial Processing
Keyword: uns n07090
– Chemical processing equipment
– Furnace components
– Heat treatment fixtures
– Petrochemical refining equipment
## Fabrication and Processing
Working with UNS N07090 requires specialized techniques due to its high strength and work-hardening characteristics:
– Machining: Requires rigid setups, sharp tools, and appropriate cutting speeds
– Welding: Can be welded using gas tungsten arc welding (GTAW) with matching filler metal
– Heat Treatment: Typically solution treated at 1080-1120°C followed by aging at 700-800°C
– Forming: Hot forming is preferred, though cold forming is possible with proper tooling
## Comparison with Other Superalloys
When compared to similar high-temperature alloys, UNS N07090 offers several advantages:
– Higher creep resistance than Inconel 718 at temperatures above 650°C
– Better oxidation resistance than Waspaloy
– Superior thermal fatigue resistance compared to Haynes 230
– More cost-effective than single crystal superalloys for many applications
## Future Developments
Research continues to enhance the capabilities of UNS N07090 and similar superalloys:
– Development of