Lega LION® 254SMO F44

F44

1.4547 / UNS S31254 / F44 / 254 SMO: Product Introduction

1.4547, also known as UNS S31254, F44, or commonly referred to as 254 SMO, is a high-alloy austenitic stainless steel with excellent corrosion resistance. This article provides a detailed introduction to 1.4547/UNS S31254/F44/254 SMO, 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.

Composizione chimica

1.4547/UNS S31254/F44/254 SMO has a specific chemical composition that contributes to its corrosion resistance and mechanical properties:

ElementoComposizione (%)
Cromo (Cr)19.5 – 20.5
Nichel (Ni)17.5 – 18.5
Molibdeno (Mo)6.0 – 6.5
Rame00,5 – 1,0
Azoto (N)0.18 – 0.22
Carbonio (C)00,020 massimo
Silicon (Si)00,80 massimo
Manganese (Mn)1,00 massimo
Fosforo (P)00,030 massimo
Zolfo (S)00,010 massimo

Proprietà meccaniche

1.4547/UNS S31254/F44/254 SMO exhibits excellent mechanical properties suitable for various applications:

ProprietàValore
Resistenza alla trazione, ksi (MPa)100 (690) min
Limite di snervamento (compensazione dello 0,2%), ksi (MPa)50 (345) min
Allungamento (% in 2 pollici)35 min
Durezza, Rockwell B (HRB)55 max

Caratteristiche prestazionali

1.4547/UNS S31254/F44/254 SMO offers outstanding performance across diverse conditions:

  • Resistenza alla corrosione: Excellent resistance to both uniform corrosion and localized corrosion, including pitting and crevice corrosion, in chloride-containing environments.
  • Resistenza alle alte temperature: Maintains strength and toughness at elevated temperatures, suitable for applications in marine and chemical processing industries.
  • Saldabilità: Good weldability with conventional methods, such as TIG and MIG welding, ensuring ease of fabrication.

Applicazioni industriali

1.4547/UNS S31254/F44/254 SMO is utilized in industries requiring robust corrosion resistance and high strength:

Settore industrialeApplicazioni
Elaborazione chimicaHeat exchangers, evaporators, and reactor tanks.
Olio e gasOffshore platforms, pipelines, and valves in harsh environments.
MarinoSeawater desalination, marine exhaust systems, and shipbuilding.

Forme e dimensioni

1.4547/UNS S31254/F44/254 SMO is available in various forms and sizes to meet specific application needs:

  • Forme: Sheets, plates, bars, tubes, pipes, fittings, and welding consumables.
  • Taglie: Thickness ranging from 0.1 mm to 50 mm for plates, and diameter ranging from 6 mm to 300 mm for round bars.

Standard di produzione

1.4547/UNS S31254/F44/254 SMO adheres to international production standards ensuring quality and performance:

Forma del prodottoForme disponibiliTaglie disponibiliStandard di produzione
Lastre/FogliFogli, PiattiSpessore: 0,1 mm – 50 mmASTM A240, EN 10088
Barre/AsteBarre tonde, Barre quadrateDiametro: 6 mm – 300 mmASTM A276, EN 10088
Tubi/tubiSenza soluzione di continuità, saldatoDiametro esterno: 6 mm – 300 mmASTM A312, ASTM A358

Saldatura e lavorazione

1.4547/UNS S31254/F44/254 SMO offers good weldability and processing characteristics:

  • Saldatura: Can be welded using standard methods like TIG, MIG, and submerged arc welding, with post-weld heat treatment recommended to maintain corrosion resistance.
  • Lavorabilità: Machinable with appropriate tooling and cutting speeds due to its high work hardening rate.

Vantaggi e svantaggi

AspettoDettagli
VantaggiExceptional corrosion resistance, high strength, excellent weldability, and suitability for critical applications in aggressive environments.
SvantaggiHigher initial cost compared to standard stainless steels, requires expertise in handling and fabrication due to its high alloy content.

Leghe simili

Nome della legaConfronto
904L (UNS N08904)Lower alloy content, slightly lower corrosion resistance compared to 1.4547/UNS S31254/F44/254 SMO, but more cost-effective.
Duplex Stainless Steels (e.g., UNS S31803)Offers a balance of strength and corrosion resistance, suitable for similar applications in marine and chemical industries.

Confronto di leghe simili

Proprietà/funzionalità1.4547/UNS S31254/F44/254 SMO904L (UNS N08904)Duplex Stainless Steel (UNS S31803)
Contenuto di cromo (%)19.5 – 20.520.0 – 25.021.0 – 23.0
Contenuto di nichel (%)17.5 – 18.523.0 – 28.04.5 – 6.5
Contenuto di molibdeno (%)6.0 – 6.54.0 – 5.02,5 – 3,5
Resistenza alla corrosioneEccellente resistenza alla corrosione indotta da cloruri, compresa vaiolatura e corrosione interstiziale.Good corrosion resistance, lower than 1.4547/UNS S31254/F44/254 SMO in chloride environments.Balanced corrosion resistance, lower than 1.4547/UNS S31254/F44/254 SMO in extreme chloride environments.
ApplicazioniChemical processing, oil and gas, marine environments.Industrie chimiche e farmaceutiche, produzione di carta.Petrolio e gas, lavorazioni chimiche, ambienti marini.

This comprehensive article introduces 1.4547/UNS S31254/F44/254 SMO, 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 highly corrosion-resistant materials for critical applications will find this information valuable in selecting the appropriate alloy to meet specific operational requirements.