Ultra

Stainless steels for extremely corrosive environments

Browse Ultra range specifications Visit Stainless Steel Finder

The Ultra range is best choice for wet corrosion challenges of your application. It contains stainless steel products for extremely corrosive environments.

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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.

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 317L

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

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

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

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

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

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

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.

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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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