Ultra

Acciai inossidabili per ambienti altamente corrosivi

Sfoglia le specifiche della gamma Ultra. Visit Stainless Steel Finder

La categoria Ultra è la scelta migliore per le sfide di corrosione a umido delle vostre applicazioni. Include prodotti in acciaio inox per ambienti altamente corrosivi.

Per gli ambienti più difficili

La gamma Outokumpu Ultra è composta da acciai inossidabili austenitici ad alte prestazioni e leghe a base di nichel che differiscono sostanzialmente dai gradi più convenzionali per quanto riguarda la resistenza alla corrosione e, in alcuni casi, anche le proprietà meccaniche e fisiche.

Scopri la nostra lega 825: scarica il whitepaper

Il 654 SMO ad alta lega colma il divario con il titanio

Ultra

La gamma Ultra include gradi austenitici altamente legati che sono progettati per ambienti estremamente corrosivi con valore PRE superiore a 27.

La gamma Ultra comprende i nostri prodotti chiave Ultra Alloy 825 (EN 2.4858), Ultra 904L (EN 1.4539) e Ultra 254 SMO (EN 1.4547), nonché diverse alternative, ad esempio Ultra 654 SMO (EN 1.4652): l'acciaio inossidabile più resistente alla corrosione al mondo, per le tue applicazioni più specifiche.

La gamma Ultra è la scelta migliore quando si necessita di materiale per ambienti estremamente corrosivi dove gradi standard quali Core 304L/4307 o Supra 316L/4404 non sono sufficienti per le sfide di corrosione della tua applicazione. 

Gli acciai inossidabili della gamma Ultra non sono solo eccellenti nella resistenza alla corrosione, ma le loro proprietà di robustezza e allungamento sono simili o migliori rispetto agli acciai inossidabili austenitici convenzionali. L'aggiunta di azoto ai gradi Ultra, ad esempio Ultra 254 SMO, conferisce loro maggiore resistenza allo snervamento e alla trazione. Nonostante la loro maggiore robustezza, questi acciai offrono ottime possibilità di formatura sia a freddo sia a caldo. Gli acciai della gamma Ultra sono particolarmente adatti alla saldatura e su questi prodotti possono essere applicati gli stessi metodi utilizzati per la saldatura degli acciai austenitici convenzionali.

Le applicazioni tipiche per i gradi della gamma Ultra sono:

  • industria chimica e petrolchimica
  • pulizia dei gas di scarico marittimi
  • scambiatori di calore
  • applicazioni che richiedono resistenza per acqua di mare clorurata.

Ultra Alloy 825 è una lega a base di nichel austenitico stabilizzato con titanio utilizzata nell'industria petrolifera e del gas in sistemi di tubazioni, attrezzature per raffinerie di petrolio e sistemi di servizio di gas acido. Ultra 904L è utilizzato nelle attrezzature dell'industria petrolchimica quali tubi, scambiatori di calore, serbatoi e contenitori di reattori. Ultra 254 SMO è adatto ad applicazioni che richiedono resistenza all'acqua di mare clorurata, pulizia dei gas di combustione, pulizia dei gas di scarico marittimi, nonché ad attrezzature per lo sbiancamento nell'industria della cellulosa e della carta e a flange e valvole.

I gradi della gamma Ultra possono essere utilizzati in un ampio ventaglio di applicazioni, con il supporto di una vasta selezione di finiture superficiali fornito da stabilimenti e Centri servizi.

Vedi di seguito l'elenco completo dei gradi Ultra

Outokumpu Ultra grades

Ultra 904L stainless steel

Ultra 904L is a high-nickel and molybdenum austenitic stainless steel with very high corrosion resistance. It was originally developed for handling sulfuric acid at ambient temperatures, and is now used in a broad range of chemical industry applications.

EN 1.4539

ASTM type 904L

ASTM UNS NO8904

Microstructure Austenitic

Typical applications

  • Chemical and petrochemical industry equipment such as pipes, heat exchangers, tanks, and reactor vessels
  • Sulfuric acid handling
  • Flanges and valves

Datasheet

Download Ultra range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

Typical chemical composition, % by mass

C 0.01

Cr 19.8

Ni 24.2

Mo 4.3

N -

Others 1.4Cu

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Ultra 254 SMO stainless steel

A 6 % molybdenum and nitrogen-alloyed austenitic stainless steel with extremely high resistance to both uniform and localized corrosion. This product was developed especially for oil and gas offshore platforms and the pulp and paper industry.

EN 1.4547

ASTM type -

ASTM UNS S31254

Microstructure Austenitic

Typical applications

  • Applications requiring resistance to chlorinated seawater
  • Flue gas cleaning
  • Maritime exhaust gas cleaning (EGC)
  • Bleaching equipment in the pulp and paper industry
  • Flanges and valves

Datasheet

Download Ultra range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

Typical chemical composition, % by mass

C 0.01

Cr 20.0

Ni 18.0

Mo 6.1

N 0.20

Others Cu

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Ultra 317L stainless steel

Ultra 317L is a molybdenum-alloyed austenitic stainless steel with higher corrosion resistance than Supra 316L/4404 – mainly used in the USA and Asia.

EN 1.4438

ASTM type

317L

 

ASTM UNS S31703

Microstructure Austenitic

Typical applications

  • Chemical processing industry

Data sheet

Dowload Ultra range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

Typical chemical composition, % by mass

C 0.02

Cr 18.2

Ni 13.7

Mo 3.1

N -

Others -

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Ultra 725LN stainless steel

Ultra 725LN is a type 310 material (high chrome and high nickel) that has been developed and optimized specifically for urea production, which demand extremely high corrosion resistance. It has similar general pitting resistance to Ultra 904L.

EN 1.4466

ASTM type -

ASTM UNS S31050

Microstructure Austenitic

Typical applications

  •  Urea applications

Product forms

Datasheet

Download Ultra range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

Typical chemical composition, % by mass

C 0.01

Cr 25.0

Ni 22.3

Mo 2.1

N 0.12

Others -

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Ultra 6XN stainless steel

Ultra 6XN is a 6 % molybdenum, high-nickel and nitrogen-alloyed austenitic product with extremely high resistance to both uniform and localized corrosion.

EN 1.4529

ASTM type -

ASTM UNS N08926/N08367

Microstructure Austenitic

Typical applications

  • Applications requiring resistance to chlorinated seawater
  • Flue gas cleaning

Datasheet

Download Ultra range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

Typical chemical composition, % by mass

C 0.01

Cr 20.5

Ni 24.8

Mo 6.5

N 0.20

Others Cu

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Ultra 654 SMO stainless steel

Ultra 654 SMO is the most corrosion-resistant stainless steel in the world. A 7 % molybdenum, very high nitrogen alloyed austenitic product with high mechanical strength. A potentially lean alternative to traditional wet-corrosion resistant nickel-based alloys.

EN 1.4652

ASTM type -

ASTM UNS S32654

Microstructure Austenitic

Typical applications

  • Pressurized and erosive systems handling chlorinated seawater at higher temperatures
  • Plate heat exchangers
  • Flue gas cleaning applications

Typical chemical composition, % by mass

C 0.01

Cr 24.0

Ni 22.0

Mo 7.3

N 0.50

Others 3.5Mn Cu

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Ultra 3964 stainless steel

Non-magnetic, high strength austenitic stainless steel with excellent corrosion resistance

EN WL 1.3964

ASTM type -

ASTM UNS -

Microstructure -

Typical applications

  • Marine application

Chemical composition, % by mass

C 0.02

Cr 20.4

Ni 15.4

Mo 3.3

N 0.26

Others Mn

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Ultra Alloy 825 nickel base alloy

Outokumpu Ultra Alloy 825 is a titanium stabilized austenitic nickel base alloy with an addition of copper.

W.-Nr. 2.4858

UNS N08825

ISO NW8825/ NiFe30Cr21Mo3

Microstructure Austenitic

Typical applications

  • Components in sour gas service
  • Offshore oil and gas piping systems
  • Equipment in petroleum refineries
  • Heating coils
  • Heat exchangers
  • Tanks
  • Scrubbers
  • Chemical processing equipment
  • Food process equipment
  • Nuclear industry equipment

Data sheet

Download Ultra Alloy 825 datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

Typical chemical composition, % by mass

C 0.01

Cr 23.0

Ni 39.5

Mo 3.2

Cu 1.7

Others Ti 0.75, Mn 0.8, Si 0.35, Al 0.1, Fe bal.

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Go directly to Outokumpu Ultra grades

Standards and approvals for Ultra range

 EN 10028-7   Flat products for pressure purposes – Stainless steels
 EN 10088-2  Stainless steels – Corrosion resisting sheet/ plate/strip for general and construction purposes
 EN 10088-3  Stainless steels – Corrosion resisting semi-finished products/bars/rods/wire/sections for general and construction purposes
 EN 10088-4   Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for construction purposes 
 EN 10088-5  Technical delivery conditions for bars, rods, wire, sections and bright products of corrosion resistant steels for construction purposes
 EN 10272  Stainless steel bars for pressure purposes 
 EN 10283  Corrosion resistant steel castings

 The most commonly used international product standards are given in the table above. For a full list of standards by product, see steelfinder.outokumpu.com   

 ASTM A 193 / ASME SA-193   Alloy and stainless steel bolts and nuts for high pressure and high temperature service 
 ASTM A 240 / ASME SA-240  Cr and Cr-Ni stainless steel plate/sheet/strip for pressure purposes
 ASTM A 276  Stainless and heat-resisting steel bars/shapes
 ASTM A 312 / ASME SA-312  Seamless and welded austenitic stainless steel pipe
 ASTM A 351 / ASME SA-351  Steel castings, austenitic, duplex for pressure containing parts
 ASTM A 358 / ASME SA-358  Electric fusion-welded austenitic Cr-Ni alloy steel pipe for high temperature 
 ASTM A 409 / ASME SA-409  Welded large diameter austenitic pipe for corrosive or high-temperature service
 ASTM A 473  Stainless steel forgings for general use 
 ASTM A 479 / ASME SA-479  Stainless steel bars for boilers and other pressure vessels
 ASTM A 743  Castings, Fe-Cr-Ni, corrosion resistant for general application
 ASTM A 744  Castings, Fe-Cr-Ni, corrosion resistant for severe service
 ASTM B 649 / ASME SB-649   Bar and wire

 The most commonly used international product standards are given in the table above. For a full list of standards by product, see steelfinder.outokumpu.com  

 NACE MR0175    Sulfide stress cracking resistant material for oil field equipment 
 Norsok M-CR-630  Material data sheets for 6Mo stainless steel
 VdTÜV WB 473  Austenitischer Stahl X 1 CrNiMoCuN 20 18 7 Werkstoff-Nr. 1.4547
 VdTÜV WB 537  Stickstofflegierter austenitischer Stahl X2CrNiMnMoN 25-18-6-5 Werkstoff-Nr 1.4565

 The most commonly used international product standards are given in the table above. For a full list of standards by product, see steelfinder.outokumpu.com

 

  • AD 2000 Merkblatt
  • Approval of Material Manufacturers
  • Factory Production Control Certificate
  • ISO 9001
  • ISO 14001
  • ISO 50001
  • ISO/TS 16949
  • NORSOK
  • OHSAS 18001
  • Pressure Equipment Directive (PED) 

For the list of certificates and approvals by mill, see outokumpu.com/certificates

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