# Stellite 6 (UNS R30006) Cobalt-Based Alloy
## Introduction to Stellite 6
Stellite 6 is a cobalt-based alloy classified under the UNS R30006 designation. This high-performance material is renowned for its exceptional wear resistance, corrosion resistance, and ability to maintain strength at elevated temperatures. Developed by the Stellite Division of Cabot Corporation, this alloy has become a staple in industries requiring durable materials for extreme operating conditions.
## Chemical Composition
The superior properties of Stellite 6 stem from its carefully balanced chemical composition:
Primary Elements
Cobalt (Co): 58-65% (base metal)
Chromium (Cr): 28-32%
Tungsten (W): 4-6%
Secondary Elements
Carbon (C): 1.0-1.7%
Silicon (Si): 1.0-2.0%
Iron (Fe): ≤3.0%
Nickel (Ni): ≤3.0%
Manganese (Mn): ≤1.0%
## Key Properties
Mechanical Properties
Hardness: 40-45 HRC (as cast)
Tensile Strength: 1000-1200 MPa
Yield Strength: 700-900 MPa
Elongation: 1-3%
Physical Properties
Density: 8.4 g/cm³
Melting Range: 1290-1425°C
Thermal Conductivity: 14.6 W/m·K
Electrical Resistivity: 0.92 μΩ·m
## Applications
Stellite 6 finds extensive use across multiple industries due to its unique combination of properties:
Industrial Applications
Valve seats and stems
Wear plates and bushings
Cutting tools and dies
Pump components
Aerospace Applications
Turbine blade coatings
Exhaust components
Bearing surfaces
Medical Applications
Orthopedic implants
Surgical instruments
Dental tools
## Fabrication and Processing
Manufacturing Methods
Casting: Investment casting is commonly used
Powder Metallurgy: For complex shapes
Welding: Used for hardfacing applications
Machining Considerations
Requires carbide or ceramic cutting tools
Low cutting speeds recommended
Coolant should be used to prevent work hardening
## Advantages Over Other Materials
Compared to Stainless Steels
Keyword: Stellite6 UNS R30006
Superior wear resistance
Better high-temperature performance
Improved galling resistance
Compared to Nickel Alloys
Higher hardness
Better resistance to adhesive wear
More stable at elevated temperatures
## Maintenance and Care
Cleaning Procedures
Use non-chlorinated solvents
Avoid abrasive cleaners that could scratch the surface
Storage Recommendations
Store in dry environments
Protect from mechanical damage</p
