STELLITE® Alloy 20 Product Introduction
STELLITE® Alloy 20 is a cobalt-based alloy known for its exceptional resistance to wear, corrosion, and high temperatures. This article provides a detailed introduction to STELLITE® Alloy 20, covering its chemical composition, mechanical properties, performance at different temperatures, industry applications, shapes and sizes, production standards, welding and processing capabilities, advantages and disadvantages, and comparisons with similar alloys.
Composición química
STELLITE® Alloy 20 is primarily composed of cobalt, chromium, tungsten, and carbon, with additional elements for enhanced properties.
| Elemento | Composición (%) |
|---|---|
| Cobalto (Co) | 32.0 – 38.0 |
| Cromo (Cr) | 19.0 – 21.0 |
| Tungsteno (W) | 2.0 – 3.0 |
| Carbono (C) | 0.15 – 0.35 |
| Níquel (Ni) | 2.0 máx. |
| Hierro (Fe) | 3.0 máx. |
| Manganeso (Mn) | 1,0 máx. |
| Silicio (Si) | 1,0 máx. |
| Fósforo (P) | 0.03 máx. |
| Azufre (S) | 0.03 máx. |
Propiedades mecánicas
STELLITE® Alloy 20 exhibits excellent mechanical properties suitable for high-wear applications:
| Propiedad | Valor |
|---|---|
| Resistencia a la tracción, ksi (MPa) | 105 (725) min |
| Límite elástico (0,2 % de compensación), ksi (MPa) | 45 (310) min |
| Alargamiento (% en 2 pulgadas) | 30 minutos |
| Dureza, Rockwell C (HRC) | 25 – 35 |
Características de presentación
STELLITE® Alloy 20 offers outstanding performance in severe conditions:
- Resistencia al desgaste: Exceptional resistance to abrasion, erosion, and metal-to-metal wear, making it ideal for high-stress wear environments.
- Resistencia a la corrosión: Excellent resistance to oxidation and corrosion in high-temperature environments, including acids and alkalis.
- Resistencia a altas temperaturas: Maintains high strength and hardness at elevated temperatures, up to approximately 1200°F (650°C).
Aplicaciones industriales
STELLITE® Alloy 20 is widely used across various industries for its wear and corrosion resistance properties:
| Sector industrial | Aplicaciones |
|---|---|
| Aeroespacial | Bearing surfaces, valve components, and turbine blades requiring high wear resistance and durability. |
| Petróleo y gas | Pump components, valve seats, and drilling tools exposed to abrasive environments and corrosive fluids. |
| Generación de energía | Boiler components, steam turbine seals, and high-wear parts in power plant equipment. |
| Industrial Machinery | Cutting tools, extrusion dies, and wear plates in manufacturing equipment. |
Formas y tamaños
STELLITE® Alloy 20 is available in various forms and sizes to meet specific application requirements:
- Formas: Láminas, placas, barras, tubos y formas personalizadas.
- Tamaños: Espesor que varía de 0,025 pulgadas a 1,000 pulgadas (0,64 mm a 25,4 mm), diámetro que varía de 0,25 pulgadas a 6,0 pulgadas (6,35 mm a 152,4 mm).
Estándares de producción
STELLITE® Alloy 20 complies with industry standards for quality and performance:
| Formulario de producto | Formas disponibles | Tamaños disponibles | Estándares de producción |
|---|---|---|---|
| Barras | Barras redondas, barras cuadradas | Diámetro: 0,25″ – 6,0″ (6,35 mm – 152,4 mm) | ASTM A732 |
| Platos/Hojas | Platos, Hojas | Espesor: 0,025″ – 1,000″ (0,64 mm – 25,4 mm) | ASTM A732 |
| Welding Rods | Rods | Diameter: 0.125″ – 0.500″ (3.18mm – 12.7mm) | AWS A5.13 |
Soldadura y procesamiento
STELLITE® Alloy 20 offers good weldability and machinability:
- Soldadura: Can be welded using conventional methods such as TIG and MIG welding with preheating and post-weld heat treatment to maintain properties.
- Procesando: Machinable using carbide tooling, although care is needed due to its high cobalt content.
Ventajas y desventajas
| Aspecto | Detalles |
|---|---|
| Ventajas | High wear resistance, excellent strength at elevated temperatures, good corrosion resistance, and ease of fabrication. |
| Desventajas | Higher cost compared to conventional materials, requires specialized machining and welding techniques due to high cobalt content. |
Aleaciones similares
| Nombre de la aleación | Comparación |
|---|---|
| STELLITE® Alloy 6 | Higher cobalt content, offering superior wear resistance and hardness compared to Alloy 20. |
Comparación de aleaciones similares
| Propiedad/Característica | STELLITE® Alloy 20 | STELLITE® Alloy 6 |
|---|---|---|
| Contenido de cobalto (%) | 32.0 – 38.0 | 54.0 – 62.0 |
| Contenido de cromo (%) | 19.0 – 21.0 | 27.0 – 32.0 |
| Tungsten Content (%) | 2.0 – 3.0 | 8.0 – 10.0 |
| Dureza, Rockwell C (HRC) | 25 – 35 | 48 – 55 |
| Aplicaciones | Valve components, extrusion dies | Aerospace components, turbine blades |
This comprehensive article provides an in-depth introduction to STELLITE® Alloy 20, highlighting its chemical composition, mechanical properties, performance characteristics, industry applications, available forms and sizes, production standards, welding and processing capabilities, as well as advantages, disadvantages, and comparisons with similar alloys. Engineers and professionals seeking durable materials for high-wear and corrosion resistance applications will find this information valuable for selecting the appropriate alloy to meet their specific needs.