55 HRC - 60 HRC Cobalt Based Alloys Stellite 21 High Temperature Resistant

Stellite 21 Alloy offers excellent wear, corrosion, and high-temperature resistance. This cobalt-based alloy is designed for high-performance applications requiring exceptional hardness and durability in severe service environments.

• Cobalt (Co): 50-60% - Base metal providing high-temperature strength and corrosion resistance
• Chromium (Cr): 28-32% - Enhances oxidation and corrosion resistance
• Tungsten (W): 5-10% - Increases hardness and wear resistance
• Carbon (C): 2.0-3.0% - Forms carbides that enhance hardness and strength
• Nickel (Ni): ≤3% - Improves toughness and resistance to corrosion
• Iron (Fe): ≤3% - Adjusts mechanical properties
• Silicon (Si): ≤1% - Aids in deoxidation during production

• Hardness: 55-60 HRC - Provides high wear resistance
• Tensile Strength: Approximately 1,200 MPa - Ensures strength under mechanical stress
• Density: 8.6 g/cm³ - Offers robustness in demanding applications
• Ductility: Low - Suitable for applications requiring minimal deformation
• High-Temperature Performance: Retains hardness and wear resistance up to 800°C

• Wear Resistance: Excellent resistance to both abrasive and adhesive wear
• Corrosion Resistance: High resistance to acids, alkalis, and seawater
• Oxidation Resistance: Maintains properties in high-temperature oxidizing environments up to 800°C

• Cutting Tools: For tools exposed to severe wear and high temperatures
• Valve Seats and Stems: For industrial valves handling corrosive and abrasive fluids
• Aerospace Components: Parts exposed to extreme temperatures and mechanical stresses
• Oil and Gas Industry: Downhole tools, valves, and equipment in harsh environments
• Industrial Machinery: Components requiring long-lasting wear resistance

• Solution Annealing: Relieves internal stresses and improves corrosion resistance
• Aging: Increases hardness and wear resistance by precipitating carbides
• Hardening: Achieves optimal hardness and wear resistance through controlled cooling

Stellite 21 Alloy is a high-performance, cobalt-based material known for its exceptional wear and corrosion resistance. Its robust chemical composition and mechanical properties make it suitable for critical applications in cutting tools, aerospace, oil and gas, and industrial machinery. The alloy's ability to maintain its properties at high temperatures ensures durability and reliability in demanding environments.