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.
Composição química
Duplex Steel F55 (UNS S32760) has a well-balanced chemical composition that enhances its corrosion resistance and mechanical strength:
| Elemento | Composição (%) |
|---|---|
| Cromo (Cr) | 24.0 – 26.0 |
| Níquel (Ni) | 6.0 – 8.0 |
| Molibdênio (Mo) | 3.0 – 4.0 |
| Cobre | 0.5 – 1.0 |
| Tungstênio (W) | 0.5 – 1.0 |
| Nitrogênio (N) | 0.20 – 0.30 |
| Carbono (C) | 00,030 máx. |
| Silício (Si) | 1,00 no máximo |
| Manganês (Mn) | 1,00 no máximo |
| Fósforo (P) | 00,030 máx. |
| Enxofre (S) | 00,010 máx. |
Propriedades mecânicas
Duplex Steel F55 (UNS S32760) exhibits excellent mechanical properties suitable for demanding applications:
| Propriedade | Valor |
|---|---|
| Resistência à tração, ksi (MPa) | 109 min (750 min) |
| Força de rendimento (compensação de 0,2%), ksi (MPa) | 80 min (550 min) |
| Alongamento (% em 2 polegadas) | 25 minutos |
| Dureza, Rockwell C (HRC) | 32 max |
Características de desempenho
Duplex Steel F55 (UNS S32760) offers superior performance across various conditions:
- Resistência à corrosão: Excellent resistance to chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion in aggressive environments, such as seawater and chemical processing.
- Força: Higher strength compared to standard duplex stainless steels, making it suitable for structural applications requiring high mechanical strength.
- Soldabilidade: Good weldability with appropriate filler materials and techniques, ensuring ease of fabrication and repair.
Aplicações Industriais
Duplex Steel F55 (UNS S32760) finds extensive use in industries requiring robust corrosion resistance and high strength:
| Setor Industrial | Formulários |
|---|---|
| Petróleo e Gás | Offshore and subsea equipment, including pipelines, risers, and subsea umbilicals. |
| Processamento Químico | Heat exchangers, pressure vessels, and tanks handling aggressive chemicals. |
| Marinho | Seawater desalination plants, marine structural components, and offshore platforms. |
Formas e tamanhos
Duplex Steel F55 (UNS S32760) is available in various forms and sizes to meet specific application needs:
- Formulários: Chapas, chapas, barras, tubos, tubulações e conexões.
- Tamanhos: Espessuras variando de 0,5 mm a 50 mm para chapas e diâmetros variando de 6 mm a 300 mm para barras redondas.
Padrões de produção
Duplex Steel F55 (UNS S32760) adheres to international production standards ensuring quality and reliability:
| Formulário de produto | Formas disponíveis | Tamanhos disponíveis | Padrões de produção |
|---|---|---|---|
| Placas/Folhas | Lençóis, Pratos | Espessura: 0,5 mm – 50 mm | ASTM A240, EN 10088 |
| Barras/hastes | Barras redondas, barras quadradas | Diâmetro: 6mm – 300mm | ASTM A276, EN 10088 |
| Canos/Tubos | Sem costura, soldado | DE: 6 mm – 300 mm | ASTM A790, ASTM A789 |
Soldagem e Processamento
Duplex Steel F55 (UNS S32760) offers good weldability and processing characteristics:
- Soldagem: Pode ser soldado usando métodos padrão como TIG, MIG e soldagem por arco submerso, com pré-aquecimento adequado e tratamento térmico pós-soldagem para manter a resistência à corrosão.
- Usinabilidade: Geralmente inferior aos aços inoxidáveis austeníticos, exigindo velocidades mais lentas e mais potência para operações de usinagem.
Vantagens e desvantagens
| Aspecto | Detalhes |
|---|---|
| Vantagens | 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. |
| Desvantagens | Lower toughness compared to austenitic stainless steels, requires careful handling during welding and fabrication due to its dual-phase microstructure. |
Comparação com ligas semelhantes
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:
| Tipo/propriedade da liga | Duplex Steel F55 (UNS S32760) | Aço Duplex F51 (UNS S31803) | Super Duplex Steel F53 (UNS S32750) |
|---|---|---|---|
| Resistência à corrosão | Excelente resistência à corrosão induzida por cloreto, incluindo corrosão por pite e em frestas. | Excellent resistance, slightly lower than F55 in aggressive chloride environments. | Enhanced resistance to pitting and crevice corrosion, particularly in seawater applications. |
| Força | 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. |
| Formulários | Offshore platforms, heat exchangers, and seawater handling systems. | Petróleo e gás, processamento químico, ambientes marinhos. | 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.