# Stellite12 UNS R30012 Alloy Properties and Applications
## Introduction to Stellite12 UNS R30012
Stellite12, also known as UNS R30012, is a cobalt-based superalloy renowned for its exceptional wear resistance, high-temperature strength, and corrosion resistance. This alloy belongs to the Stellite family of materials, which are widely used in demanding industrial applications where durability and performance are critical.
## Chemical Composition
The chemical composition of Stellite12 UNS R30012 plays a crucial role in its performance characteristics:
Cobalt (Co): 50-55%
Chromium (Cr): 28-32%
Tungsten (W): 7-9%
Carbon (C): 1-1.4%
Keyword: Stellite12 UNS R30012
Iron (Fe): 3% max
Nickel (Ni): 3% max
Silicon (Si): 1% max
Manganese (Mn): 1% max
## Mechanical Properties
Stellite12 exhibits impressive mechanical properties that make it suitable for extreme conditions:
Room Temperature Properties
Tensile Strength: 100-120 ksi (690-830 MPa)
Yield Strength: 60-80 ksi (415-550 MPa)
Elongation: 5-10%
Hardness: 38-45 HRC
Elevated Temperature Properties
Maintains strength up to 800°C (1472°F)
Excellent creep resistance
Good thermal fatigue resistance
## Physical Properties
Density: 8.5 g/cm³
Melting Range: 1290-1425°C (2354-2597°F)
Thermal Conductivity: 14.6 W/m·K
Thermal Expansion Coefficient: 12.5 μm/m·K (20-100°C)
## Key Characteristics
Stellite12 UNS R30012 offers several unique characteristics that distinguish it from other alloys:
Wear Resistance
Excellent resistance to abrasive, adhesive, and erosive wear
Maintains hardness at elevated temperatures
Corrosion Resistance
Good resistance to oxidizing and reducing environments
Performs well in acidic and alkaline conditions
High Temperature Performance
Retains mechanical properties at elevated temperatures
Resistant to thermal shock
## Manufacturing and Processing
Stellite12 can be processed through various methods:
Casting: Investment casting is commonly used
Powder Metallurgy: For complex shapes and components
Welding: Can be welded using appropriate techniques
Machining: Requires specialized tools due to its hardness
## Applications of Stellite12 UNS R30012
The unique combination of properties makes Stellite12 suitable for numerous demanding applications:
Industrial Applications
Valve components (seats, stems, and trim)
Pump parts for abrasive slurry service
Wear plates and bushings
Cutting tools and dies
Aerospace Applications
Gas turbine components
Exhaust valves
High-temperature fasteners
Oil and Gas Industry
Downhole tools
Drilling equipment
