Acciai inossidabili per ambienti altamente corrosivi

Ultra

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.

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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.

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  • 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
Typical chemical composition, % by mass
  • C: 0.01
  • Cr: 19.8
  • Ni: 24.2
  • Mo: 4.3
  • N: -
  • Others: 1.4Cu

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.

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  • 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
Typical chemical composition, % by mass
  • C: 0.01
  • Cr: 20.0
  • Ni: 18.0
  • Mo: 6.1
  • N: 0.20
  • Others: Cu

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.

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  • EN: 1.4438
  • ASTM type:

    317L

     

  • ASTM UNS: S31703
  • Microstructure : Austenitic
Typical applications
  • Chemical processing industry
Typical chemical composition, % by mass
  • C: 0.02
  • Cr: 18.2
  • Ni: 13.7
  • Mo: 3.1
  • N: -
  • Others : -

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.

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  • EN: 1.4466
  • ASTM type: -
  • ASTM UNS: S31050
  • Microstructure: Austenitic
Typical applications
  •  Urea applications
Product forms
Typical chemical composition, % by mass
  • C: 0.01
  • Cr: 25.0
  • Ni: 22.3
  • Mo: 2.1
  • N: 0.12
  • Others: -

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.

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  • EN: 1.4529
  • ASTM type: -
  • ASTM UNS: N08926/N08367
  • Microstructure: Austenitic
Typical applications
  • Applications requiring resistance to chlorinated seawater
  • Flue gas cleaning
Typical chemical composition, % by mass
  • C: 0.01
  • Cr: 20.5
  • Ni: 24.8
  • Mo: 6.5
  • N: 0.20
  • Others: Cu

Sanicro® 35 nickel base alloy

Sanicro® 35 is the latest addition to the Outokumpu Ultra range bridging the gap between high performance stainless steel and conventional nickel base alloys. This new grade has excellent corrosion resistance in combination with high mechanical strength. Due to its leaner alloying concept Sanicro® 35 can be an attractive and cost competitive alternative to nickel base alloys with similar properties.

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  • W. Nr: -
  • UNS: N08935
  • ISO: -
  • Microstructure: Austenitic
Sanicro®35 in a nutshell
  • Excellent resistance to pitting and crevice corrosion
  • Excellent resistance to stress corrosion cracking (SCC)
  • Very suitable in seawater applications
  • High resistance to uniform corrosion in acid and caustic environments
  • High resistance to erosion-corrosion
  • Very high mechanical strength
  • Good fabrication properties such as forming and welding

Sanicro® is a trademark owned by Alleima AB

Typical applications
  • Heat exchangers
  • Equipment in oil refineries
  • Equipment in biorefineries
  • Equipment in chemical process industry
  • Seawater and brine handling equipment

 

Product forms

Typical chemical composition, % by mass
  • C: 0.02
  • Cr: 27.0
  • Ni: 35.5
  • Mo: 6.4
  • N: 0.27
  • Others : Cu

Ultra Alloy 825 nickel base alloy

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

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  • 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
Typical chemical composition, % by mass
  • C: 0.01
  • Cr: 23.0
  • Ni: 39.0
  • Mo: 3.2
  • Cu: 1.7
  • Others: Ti 0.75, Mn 0.8, Si 0.35, Al 0.1, Fe bal.

Consulta le qualità di acciaio in Steel Finder

Steel Finder

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.

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

 

 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, visit Steel Finder.

 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

Outokumpu Ultra range downloads

Outokumpu Ultra range datasheet
Sanicro® 35 datasheet
Outokumpu Product Ranges chart
Outokumpu Degerfors quarto plate product and dimension program
Machining guidelines for high-alloy-superaustenitic stainless 654 SMO®
Machining guidelines for high alloyed superaustenitic stainless steel 254 SMO®
Machining guidelines for standard austenitic stainless steel grades