# 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, corrosion resistance, and high-temperature strength. This alloy belongs to the Stellite family of materials developed by Deloro Stellite (now part of Kennametal) for demanding industrial applications.
## Chemical Composition
The chemical composition of Stellite12 UNS R30012 plays a crucial role in its performance characteristics:
Cobalt (Co): 52-58%
Chromium (Cr): 28-32%
Tungsten (W): 7-9%
Carbon (C): 1-1.4%
Iron (Fe): ≤3%
Nickel (Ni): ≤2.5%
Silicon (Si): ≤1%
Manganese (Mn): ≤1%
## Mechanical Properties
Physical Properties
Density: 8.4 g/cm³
Melting Range: 1290-1425°C (2354-2597°F)
Mechanical Properties at Room Temperature
Tensile Strength: 800-1000 MPa
Yield Strength: 500-700 MPa
Elongation: 1-3%
Hardness: 40-45 HRC
## Key Characteristics
Stellite12 UNS R30012 exhibits several notable characteristics that make it valuable for industrial applications:
Wear Resistance
The alloy maintains excellent wear resistance even at elevated temperatures, making it suitable for sliding wear applications.
Corrosion Resistance
Stellite12 demonstrates good resistance to various corrosive environments, including oxidizing acids and seawater.
High-Temperature Performance
The material retains its mechanical properties at temperatures up to 800°C (1472°F).
Gall Resistance
The alloy shows superior resistance to galling and seizing compared to many other materials.
## Applications of Stellite12 UNS R30012
Due to its unique combination of properties, Stellite12 finds applications in various industries:
Valve Components
Valve seats, stems, and trim components in severe service applications
Oil and Gas Industry
Downhole tools, drilling equipment, and pump components
Power Generation
Steam turbine components, boiler parts, and nuclear power plant equipment
Chemical Processing
Pump shafts, seals, and other components exposed to corrosive media
Aerospace
Bearings, bushings, and other wear-resistant components
## Fabrication and Processing
Stellite12 UNS R30012 can be processed using various methods:
Casting
The alloy is commonly produced through investment casting for complex shapes.
Keyword: Stellite12 UNS R30012
Powder Metallurgy
Used for producing near-net-shape components with controlled porosity.
Welding
Stellite12 can be applied as a hardfacing material using various welding techniques.
Machining
Requires specialized tooling and techniques due to its work-hardening characteristics.
## Comparison with Other Stellite
