Cobalt Alloys HY ST31 / Stellite 31 / UNS R30031 Product Introduction
Cobalt alloys such as HY ST31 (Stellite 31) and UNS R30031 are renowned for their exceptional resistance to wear, corrosion, and high temperatures. This article provides a comprehensive introduction to these alloys, covering their 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
HY ST31 (Stellite 31) and UNS R30031 have a complex chemical composition designed to achieve their high-performance properties:
| Elemento | Composición (%) |
|---|---|
| Cobalto (Co) | 30.0 – 34.0 |
| Cromo (Cr) | 27.0 – 31.0 |
| Tungsteno (W) | 12.0 – 15.0 |
| Níquel (Ni) | 3.0 – 5.0 |
| Hierro (Fe) | 3.0 – 4.5 |
| Molibdeno (Mo) | 2.0 – 3.5 |
| Carbono (C) | 0.05 – 0.15 |
| Manganeso (Mn) | 1,0 máx. |
| Silicio (Si) | 1,0 máx. |
| Fósforo (P) | 0.04 max |
| Azufre (S) | 0.04 max |
Propiedades mecánicas
HY ST31 (Stellite 31) and UNS R30031 exhibit excellent mechanical properties suitable for high-stress applications:
| Propiedad | Valor |
|---|---|
| Resistencia a la tracción, ksi (MPa) | 135 (930) minutos |
| Límite elástico (0,2 % de compensación), ksi (MPa) | 105 (725) min |
| Alargamiento (% en 2 pulgadas) | 20 minutos |
| Dureza, Rockwell C (HRC) | 38 – 44 |
Características de presentación
These cobalt alloys offer outstanding performance in severe environments:
- Resistencia al desgaste: Exceptional resistance to abrasion, erosion, and metal-to-metal wear, making them ideal for high-stress wear applications.
- Resistencia a la corrosión: Excellent resistance to oxidation and corrosion in high-temperature and corrosive environments, including acids and alkalis.
- Resistencia a altas temperaturas: Maintains strength and hardness at elevated temperatures, up to approximately 1200°F (650°C).
Aplicaciones industriales
HY ST31 (Stellite 31) and UNS R30031 are utilized across various industries where durability and resistance to wear and corrosion are critical:
| Sector industrial | Aplicaciones |
|---|---|
| Aeroespacial | Turbine blades, combustion chambers, and high-temperature engine components. |
| Petróleo y gas | Valves, pump components, and drilling equipment exposed to abrasive and corrosive fluids. |
| Medical | Surgical instruments, prosthetic devices, and biomedical implants requiring wear and corrosion resistance. |
Formas y tamaños
These alloys are available in various forms and sizes to suit different applications:
- 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
HY ST31 (Stellite 31) and UNS R30031 conform to industry standards ensuring quality and reliability:
| Formulario de producto | Formas disponibles | Tamaños disponibles | Estándares de producción |
|---|---|---|---|
| Barras/varillas | Barras redondas, barras cuadradas | Diámetro: 0,25″ – 6,0″ (6,35 mm – 152,4 mm) | ASTM A732, AMS 5759 |
| Platos/Hojas | Platos, Hojas | Espesor: 0,025″ – 1,000″ (0,64 mm – 25,4 mm) | ASTM A732, AMS 5537 |
| alambres | alambres | Diámetro: 0,010″ – 0,250″ (0,25 mm – 6,35 mm) | ASTM A580, AMS 5832 |
| Tubos/Tuberías | Tubos, Tuberías | Diámetro exterior: 0,250″ – 6,000″ (6,35 mm – 152,4 mm) | ASTM A732, AMS 5759 |
Soldadura y procesamiento
HY ST31 (Stellite 31) and UNS R30031 offer good weldability and machinability:
- Soldadura: Se puede soldar mediante métodos estándar como soldadura TIG y MIG con un precalentamiento adecuado y un tratamiento térmico posterior a la soldadura.
- Procesando: Machinable using carbide tools, although care is needed due to their high hardness and toughness.
Ventajas y desventajas
| Aspecto | Detalles |
|---|---|
| Ventajas | High wear resistance, excellent strength at elevated temperatures, good corrosion resistance, and versatility in various applications. |
| Desventajas | Higher cost compared to conventional materials, requires expertise in handling due to their high strength and hardness. |
Aleaciones similares
| Nombre de la aleación | Comparación |
|---|---|
| Cobalt Alloy 6 | Higher cobalt content, offering superior wear resistance and hardness compared to HY ST31 and UNS R30031. |
Comparación de aleaciones similares
| Propiedad/Característica | HY ST31 / UNS R30031 | Cobalt Alloy 6 |
|---|---|---|
| Contenido de cobalto (%) | 30.0 – 34.0 | 54.0 – 62.0 |
| Contenido de cromo (%) | 27.0 – 31.0 | 25.0 – 32.0 |
| Tungsten Content (%) | 12.0 – 15.0 | 8.0 – 10.0 |
| Dureza, Rockwell C (HRC) | 38 – 44 | 48 – 55 |
| Aplicaciones | Aerospace, Oil & Gas, Medical | Herramientas industriales, componentes de desgaste. |
This detailed article provides a comprehensive introduction to HY ST31 (Stellite 31) and UNS R30031, highlighting their 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-resistant applications will find this information valuable for selecting the appropriate alloy to meet their specific needs.