Duplex Steel F55 (UNS S32760): Product Introduction
Duplex stainless steel F55, also known as UNS S32760, is a highly corrosion-resistant alloy with superior mechanical properties. This article provides a comprehensive introduction to Duplex Steel F55 (UNS S32760), 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.
Composition chimique
Duplex Steel F55 (UNS S32760) has a well-balanced chemical composition that enhances its corrosion resistance and mechanical strength:
| Élément | Composition (%) |
|---|---|
| Chrome (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6,0 – 8,0 |
| Molybdène (Mo) | 3.0 – 4.0 |
| Cuivre | 0.5 – 1.0 |
| Tungstène (W) | 0.5 – 1.0 |
| Azote (N) | 0.20 – 0.30 |
| Carbone (C) | 00,030 maximum |
| Silicium (Si) | 1,00 maximum |
| Manganèse (Mn) | 1,00 maximum |
| Phosphore (P) | 00,030 maximum |
| Soufre (S) | 00,010 maximum |
Propriétés mécaniques
Duplex Steel F55 (UNS S32760) exhibits excellent mechanical properties suitable for demanding applications:
| Propriété | Valeur |
|---|---|
| Résistance à la traction, ksi (MPa) | 109 min (750 min) |
| Limite d'élasticité (compensation de 0,2 %), ksi (MPa) | 80 min (550 min) |
| Allongement (% en 2 pouces) | 25 minutes |
| Dureté, Rockwell C (HRC) | 32 max |
Caractéristiques de performance
Duplex Steel F55 (UNS S32760) offers superior performance across various conditions:
- Résistance à la corrosion : Excellent resistance to chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion in aggressive environments, such as seawater and chemical processing.
- Force: Higher strength compared to standard duplex stainless steels, making it suitable for structural applications requiring high mechanical strength.
- Soudabilité : Good weldability with appropriate filler materials and techniques, ensuring ease of fabrication and repair.
Applications industrielles
Duplex Steel F55 (UNS S32760) finds extensive use in industries requiring robust corrosion resistance and high strength:
| Secteur industriel | Applications |
|---|---|
| Pétrole et Gaz | Offshore and subsea equipment, including pipelines, risers, and subsea umbilicals. |
| Traitement chimique | Heat exchangers, pressure vessels, and tanks handling aggressive chemicals. |
| Marin | Seawater desalination plants, marine structural components, and offshore platforms. |
Formes et tailles
Duplex Steel F55 (UNS S32760) is available in various forms and sizes to meet specific application needs:
- Formes: Feuilles, plaques, barres, tubes, tuyaux et raccords.
- Tailles : Épaisseur allant de 0,5 mm à 50 mm pour les plaques, et diamètre allant de 6 mm à 300 mm pour les barres rondes.
Normes de production
Duplex Steel F55 (UNS S32760) adheres to international production standards ensuring quality and reliability:
| Formulaire de produit | Formes disponibles | Tailles disponibles | Normes de production |
|---|---|---|---|
| Plaques/Feuilles | Feuilles, plaques | Épaisseur : 0,5 mm – 50 mm | ASTM A240, EN 10088 |
| Barres/tiges | Barres rondes, barres carrées | Diamètre : 6 mm – 300 mm | ASTM A276, EN 10088 |
| Tuyaux/Tubes | Sans soudure, soudé | Diamètre extérieur : 6 mm – 300 mm | ASTM A790, ASTM A789 |
Soudage et transformation
Duplex Steel F55 (UNS S32760) offers good weldability and processing characteristics:
- Soudage: Peut être soudé en utilisant des méthodes standard telles que le soudage TIG, MIG et à l'arc submergé, avec un préchauffage et un traitement thermique post-soudage appropriés pour maintenir la résistance à la corrosion.
- Usinabilité : Généralement inférieur aux aciers inoxydables austénitiques, nécessitant des vitesses plus lentes et plus de puissance pour les opérations d'usinage.
Avantages et inconvénients
| Aspect | Détails |
|---|---|
| Avantages | Exceptional corrosion resistance in aggressive environments, high strength, good weldability, suitable for a wide range of applications in marine, oil and gas, and chemical industries. |
| Désavantages | Lower toughness compared to austenitic stainless steels, requires careful handling during welding and fabrication due to its dual-phase microstructure. |
Comparaison avec des alliages similaires
Duplex Steel F55 (UNS S32760) is often compared with other duplex stainless steels such as F51 (UNS S31803) and super duplex stainless steels like F53 (UNS S32750). Here’s a brief comparison:
| Type/propriété de l'alliage | Duplex Steel F55 (UNS S32760) | Acier duplex F51 (UNS S31803) | Super Duplex Steel F53 (UNS S32750) |
|---|---|---|---|
| Résistance à la corrosion | Excellente résistance à la corrosion induite par les chlorures, y compris la corrosion par piqûres et fissures. | Excellent resistance, slightly lower than F55 in aggressive chloride environments. | Enhanced resistance to pitting and crevice corrosion, particularly in seawater applications. |
| Force | Highest strength among duplex steels, ideal for heavy-duty applications in harsh environments. | High strength with good toughness, suitable for general-purpose applications. | Higher strength compared to standard duplex steels, suitable for structural applications. |
| Applications | Offshore platforms, heat exchangers, and seawater handling systems. | Pétrole et gaz, transformation chimique, milieux marins. | Similar applications with broader use in structural and architectural applications. |
This detailed article introduces Duplex Steel F55 (UNS S32760), 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.