# UNS N07090 Alloy Properties and Applications
## Introduction to UNS N07090 Alloy
UNS N07090 is a nickel-based superalloy known for its exceptional high-temperature strength and corrosion resistance. This alloy belongs to the family of precipitation-hardening nickel-chromium-cobalt alloys, making it suitable for demanding applications in aerospace, power generation, and chemical processing industries.
## Chemical Composition
The chemical composition of UNS N07090 plays a crucial role in its performance characteristics:
– Nickel (Ni): 45-50%
– Chromium (Cr): 18-21%
– Cobalt (Co): 15-21%
Keyword: uns n07090
– Molybdenum (Mo): 3-5%
– Titanium (Ti): 2.5-3.5%
– Aluminum (Al): 1.2-1.8%
– Iron (Fe): ≤2.0%
– Carbon (C): ≤0.12%
– Boron (B): ≤0.015%
– Zirconium (Zr): ≤0.07%
## Mechanical Properties
UNS N07090 exhibits impressive mechanical properties across a wide temperature range:
### Room Temperature Properties
– Tensile Strength: 1200-1400 MPa
– Yield Strength: 800-1000 MPa
– Elongation: 10-15%
– Hardness: 35-40 HRC
### Elevated Temperature Properties
– Tensile Strength at 650°C: 900-1100 MPa
– Creep Resistance: Excellent up to 815°C
– Fatigue Strength: Superior at high temperatures
## Physical Properties
The physical characteristics of UNS N07090 include:
– Density: 8.2 g/cm³
– Melting Range: 1260-1335°C
– Thermal Expansion Coefficient: 13.5 × 10⁻⁶/°C (20-1000°C)
– Thermal Conductivity: 11.4 W/m·K at 100°C
– Electrical Resistivity: 1.25 μΩ·m at 20°C
## Heat Treatment
Proper heat treatment is essential for optimizing the properties of UNS N07090:
– Solution Treatment: 1080-1120°C followed by rapid cooling
– Aging Treatment: 700-800°C for 8-16 hours
– Stress Relieving: 850-900°C for 2-4 hours
## Corrosion Resistance
UNS N07090 offers excellent corrosion resistance in various environments:
– Oxidation resistance up to 1100°C
– Resistance to sulfidation and carburization
– Good performance in chloride-containing environments
– Resistance to hot corrosion in gas turbine applications
## Fabrication and Machining
Working with UNS N07090 requires special considerations:
### Forming
– Hot working recommended between 980-1175°C
– Cold forming possible but requires intermediate annealing
– Low ductility at room temperature
### Machining
– Requires rigid machine setups
– Use positive rake angles and sharp cutting tools
– Recommended to use carbide or ceramic tooling
– Generates high cutting forces
### Welding
– Gas tungsten arc welding (GTAW) preferred
– Requires post-weld heat treatment
– Matching filler metals recommended
– Susceptible to hot cracking if not properly controlled
## Applications of UNS N07090
The unique combination of properties makes UNS N07090 suitable for various demanding applications:
### Aerospace Industry
– Turbine blades and vanes
– Combustion chamber components
– Afterburner parts
– Exhaust systems
### Power Generation
– Gas turbine components
– Steam turbine blades
– Nuclear reactor parts
– High-temperature fasteners
### Industrial Applications
– Chemical processing equipment
– Heat treatment fixtures
– High-temperature springs
– Fasteners
