Outokumpu Ultra range

stainless steels for extremely corrosive environments

The Ultra range contains stainless steel products meant for extremely corrosive environments (PRE of more than 27).

Key grades

Ultra 904L

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

Ultra 254 SMO

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.

 

We believe in the world that lasts forever

Why Ultra range

  • The best choice when you know that grades like 304L/4307 and 316L/4404 are not sufficient for the wet corrosion challenges of your application
  • Includes Ultra 904L and Ultra 254 SMO as well as several alternatives
  • Outokumpu has decades of experience developing, testing and using our products in close co-operation with customers.
  • Why Outokumpu

    • Outokumpu is a global leader in stainless steel, and innovator of the first stainless steels in the world.
    • A strong customer focus, sustainability, and technical excellence are at the heart of everything we do.
    • As a customer you benefit from our strong R&D and technical support

    Why stainless steel

    • The durability of stainless steel means that it is not only the best, but also the most economically sustainable choice for a wide range of applications.
    • All of our products are made from an average of 85% recycled material and are fully recyclable at the end of their lifecycles.
     

    Outokumpu Ultra stainless steel grades

    Ultra 904L

    Description

    A high-nickel and molybdenum austenitic stainless steel with very high corrosion resistance. Ultra 904L 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

    Ultra 254 SMO

    Description

    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

    Ultra 317L

    Description

    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 -

    Ultra 4439

    Description

    A molybdenum and nitrogen-alloyed austenitic stainless steel with significantly higher corrosion resistance than Supra 316L/4404. Also known as 317LMN.

     

    EN 1.4439

    ASTM type 317LMN

    ASTM UNS S31726

    Microstructure Austenitic

    Typical applications

    • Chemical processing industry
    • Flue gas cleaning
    • 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 0.02

    Cr 17.3

    Ni 13.7

    Mo 4.1

    N 0.14

    Others -

    Ultra 725LN

    Description

    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 -

    Ultra 6XN

    Description

    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

    Ultra 4565

    Description A 4.5% molybdenum, very high nitrogen alloyed austenitic stainless steel with excellent corrosion resistance and high mechanical strength.

    EN 1.4565

    ASTM type -

    ASTM UNS S34565

    Microstructure Austenitic

    Typical applications

    • Flue gas desulfurization applications

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

    Typical chemical composition, % by mass

    C 0.02

    Cr 24.0

    Ni 17.0

    Mo 4.5

    N 0.45

    Others 5.5Mn

    Ultra 654 SMO

    Description

    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

    Ultra Alloy 825

    Description 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 range 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.

    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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