The Ultra range contains stainless steel products meant for extremely corrosive environments (PRE of more than 27).
Outokumpu Ultra range
stainless steels for extremely corrosive environments
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.
Stainless steels for extremely corrosive conditions.
Outokumpu Ultra range
We believe in the world that lasts forever
Why Ultra range
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
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 19.8
Ni 24.2
Mo 4.3
N -
Others 1.4Cu
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
Product forms
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
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 0.02
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
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 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
Product forms
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
Product forms
Datasheet Download Ultra range datasheet
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
Outokumpu Ultra range downloads
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
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 20.0
Ni 18.0
Mo 6.1
N 0.20
Others Cu