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Stellite 21
Material Type
Metal
Material Name
Stellite 21
Alternative Names
UNS R30021
Process Compatibility
CNC Milling, CNC Turning
introduction
Stellite 21 in CNC Machining
Stellite 21, also known as UNS R30021 or Co-Cr-Mo alloy, contains 27.5% Cr, over 5.5% Mo, 0.25% C, and other elements.
Containing over 5.5% Mo, Stellite is a low-carbon cobalt-chromium alloy strengthened with molybdenum. It exhibits lower hardness at room temperature but increases in hardness after cooling. It boasts excellent high-temperature corrosion resistance, abrasion resistance, as well as superior toughness and comprehensive mechanical properties. It is ideal for hardfacing various hot stamping dies.
Stellite 21 finds widespread applications across industries including aerospace, chemical, energy, petroleum, and natural gas. It is favored for applications such as valves, seals, nozzles, valve stems, turbine blades, various fluid valves, and valve seats. Precision machining is often required to meet specific dimensional and surface requirements, involving high-precision cutting, grinding, and precision milling.
Properties
Properties Table of Stellite 21
Mechanical Properties | |
---|---|
Ultimate Tensile Strength | About 1100 MPa |
Yield Strength | About 950 MPa |
Young's Modulus(Elasticity) | About 240 GPa |
Elongation at Break | 1-2 % |
Hardness (without heat treament) | About 50 HRC |
Density | 8.53 g/cm³ |
Physical Properties | |
Corrosion Resistance | Good |
Magnetism | Non-Magnetic |
Weldability | Moderate |
Thermal Properties | |
Thermal Expansion Coefficient | 11.3 μm/m°C |
Thermal Conductivity | 14.6 W/m·K |
Electrical Properties | |
Electrical Resistivity | 62 μΩ*cm |
TECHNOLOGY OVERVIEW
Basic Knowledge of Stellite 21
What is Stellite 21?
Stellite 21 is a cobalt-based alloy, also known as CoCrMo alloy. It is a tungsten-chromium-cobalt alloy composed of cobalt (Co), chromium (Cr) and molybdenum (Mo). It has excellent wear, corrosion and high temperature resistance.
Stellite 21 is commonly used in industrial applications that require high temperature wear and corrosion resistance, such as aerospace, petrochemical, and energy. Its stable mechanical properties, ability to maintain its strength and stability in high temperature environments, make it an ideal choice for manufacturing wear-resistant parts and high-temperature working components.
Advantages of Stellite 21
Wear Resistance
High Temperature Resistance
Strong Corrosion Resistance
Good Mechanical Properties
High Strength and Toughness
Excellent Processability
Good Weldability
Applications of Stellite 21
Combustion Chamber Parts
Turbine Parts
Custom Valves
Auto Parts
Chemical Parts
Pipeline Parts
Coal Mill Parts
FAQ
Machining Stellite 21 Buying FAQs
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