Duplex Steel F51 (UNS S31803): Product Introduction
Duplex stainless steel F51 (UNS S31803) is a versatile and highly corrosion-resistant alloy known for its excellent combination of mechanical properties and resistance to various corrosive environments. This article provides a comprehensive introduction to Duplex Steel F51 (UNS S31803), 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 a comparison with similar alloys.
Composición química
Duplex Steel F51 (UNS S31803) has a balanced chemical composition that contributes to its corrosion resistance and mechanical strength:
| Elemento | Composición (%) |
|---|---|
| Cromo (Cr) | 21,0 – 23,0 |
| Níquel (Ni) | 4,5 – 6,5 |
| Molibdeno (Mo) | 2,5 – 3,5 |
| Nitrógeno (N) | 0.08 – 0.20 |
| Carbono (C) | 0.030 máx. |
| Silicio (Si) | 1,00 máximo |
| Manganeso (Mn) | 2.00 max |
| Fósforo (P) | 0.030 máx. |
| Azufre (S) | 0.020 máx. |
Propiedades mecánicas
Duplex Steel F51 (UNS S31803) exhibits excellent mechanical properties suitable for a wide range of applications:
| Propiedad | Valor |
|---|---|
| Resistencia a la tracción, ksi (MPa) | 65 min (450 min) |
| Límite elástico (0,2 % de compensación), ksi (MPa) | 45 min (310 min) |
| Alargamiento (% en 2 pulgadas) | 25 minutos |
| Dureza, Rockwell C (HRC) | 30 max |
Características de presentación
Duplex Steel F51 (UNS S31803) offers superior performance across diverse conditions:
- Resistencia a la corrosión: Excellent resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion in chloride-rich environments, making it suitable for marine and offshore applications.
- Fortaleza: Higher strength compared to austenitic stainless steels, combined with good toughness, ensuring structural integrity in demanding environments.
- Soldabilidad: Good weldability with suitable filler materials and techniques, facilitating ease of fabrication and repair.
Aplicaciones industriales
Duplex Steel F51 (UNS S31803) finds extensive use in industries requiring robust corrosion resistance and mechanical strength:
| Sector industrial | Aplicaciones |
|---|---|
| Petróleo y gas | Subsea pipelines, offshore platforms, and components exposed to aggressive environments. |
| Procesamiento químico | Heat exchangers, storage tanks, and reactor vessels handling corrosive chemicals. |
| Marina | Propeller shafts, seawater desalination plants, and marine exhaust systems. |
Formas y tamaños
Duplex Steel F51 (UNS S31803) is available in various forms and sizes to meet specific application needs:
- Formas: Chapas, placas, barras, tubos, caños y accesorios.
- Tamaños: Espesores que van desde 0,5 mm hasta 50 mm para placas, y diámetros que van desde 6 mm hasta 300 mm para barras redondas.
Estándares de producción
Duplex Steel F51 (UNS S31803) conforms to international production standards ensuring quality and reliability:
| Formulario de producto | Formas disponibles | Tamaños disponibles | Estándares de producción |
|---|---|---|---|
| Platos/Hojas | Hojas, Placas | Espesor: 0,5 mm – 50 mm | ASTM A240, EN 10088 |
| Barras/varillas | Barras redondas, barras cuadradas | Diámetro: 6 mm – 300 mm | ASTM A276, EN 10088 |
| Tuberías/Tubos | Sin costura, soldada | Diámetro exterior: 6 mm – 300 mm | ASTM A790, ASTM A789 |
Soldadura y procesamiento
Duplex Steel F51 (UNS S31803) offers good weldability and processing characteristics:
- Soldadura: Se puede soldar utilizando métodos estándar como TIG, MIG y soldadura por arco sumergido, con un precalentamiento adecuado y un tratamiento térmico posterior a la soldadura para mantener la resistencia a la corrosión.
- Maquinabilidad: Generalmente más bajos que los aceros inoxidables austeníticos, requieren velocidades más lentas y más potencia para las operaciones de mecanizado.
Ventajas y desventajas
| Aspecto | Detalles |
|---|---|
| Ventajas | Excellent corrosion resistance, high strength, cost-effectiveness compared to super austenitic and nickel-based alloys, suitable for a wide range of applications in aggressive environments. |
| Desventajas | Lower toughness compared to austenitic stainless steels, may require specialized handling during welding and fabrication due to duplex structure. |
Comparación con aleaciones similares
Duplex Steel F51 (UNS S31803) is often compared with other duplex stainless steels such as F60 (UNS S32205) and super austenitic stainless steels like 904L (UNS N08904). Here’s a brief comparison:
| Tipo/propiedad de aleación | Acero dúplex F51 (UNS S31803) | Duplex Steel F60 (UNS S32205) | Super Austenitic Stainless Steel (904L, UNS N08904) |
|---|---|---|---|
| Resistencia a la corrosión | Excelente resistencia a la corrosión inducida por cloruro, incluida la corrosión por picaduras y grietas. | Enhanced resistance to localized corrosion due to higher chromium and molybdenum content. | Good corrosion resistance, lower than duplex stainless steels in chloride environments. |
| Fortaleza | Higher strength compared to austenitic stainless steels, good toughness. | Similar strength characteristics with improved corrosion resistance. | Lower strength compared to duplex stainless steels, good formability. |
| Aplicaciones | Petróleo y gas, procesamiento químico, ambientes marinos. | Similar applications with enhanced corrosion resistance in aggressive chloride environments. | Industrias química y farmacéutica, producción de papel. |
This detailed article introduces Duplex Steel F51 (UNS S31803), 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 a comparison with similar alloys. Engineers and professionals seeking durable materials for applications requiring corrosion resistance and high strength will find this information valuable for selecting the appropriate alloy to meet specific operational needs.