Outokumpu Ultra range Ultra Alloy 825

Outokumpu Ultra Alloy 825 is a titanium stabilized nickel base alloy with an addition of copper. It contains about 40 % nickel, and it has an austenitic microstructure. Ultra Alloy 825 is a new product in Outokumpu’s Ultra range, which are meant for extremely corrosive environments.

The titanium stabilization together with the low carbon content reduce the risk to form chromium carbide precipitations when used at temperatures where e.g. stainless steels may be sensitive to this phenomenon. This makes the alloy less sensitive to intergranular corrosion.

The alloy is intended for use in the chemical and oil industries. One of the primary advantages of Ultra Alloy 825 is its good resistance to sulphur containing environments where it has superior resistance to hydrogen and hydrogen sulphide induced cracking.

Outokumpu offers Ultra Alloy 825 in coil up to width of 1,500 mm, both hot and cold rolled. Ultra Alloy 825 is also available as wire rod in our long products portfolio.

Outokumpu Ultra Alloy 825 is a titanium stabilized austenitic nickel base alloy with an addition of copper. It is a new product in Outokumpu’s Ultra range.


Outokumpu Ultra Alloy 825 solutions

Key benefits of Outokumpu Ultra Alloy 825

More productivity

  • Wide coils means that pipe and tube manufacturers can improve their productivity compared with manufacturing from plate or more narrow coil dimensions.
  • We provide cold rolled coils wider than 1219 mm in weights up to 12 tonnes or more.

Improved tolerances

  • Coil produced products have improved tolerances compared to plate produced products.

Competitive lead-times

  • We use our melt shop in Avesta, Sweden, for continuous casting of high quality slabs.
  • We can offer large quantities with competitive lead-times for project business.

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.




Thickness (mm)

Width (mm)




Thickness (mm)

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Other sizes are available on request.


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