​​​​​​​​​​​​​High performance austenitic grades – made for the harshest conditions


If you need material for a harsh environment like an offshore oil platform or desalination plant, the chances are that your choice will be an Outokumpu high-alloyed, high-performance austenitic grade.

Our high-alloyed, high-performance austenitic grades are available for a wide range of process conditions, providing the right protection against corrosion, material deterioration or maintenance need.

Typical applications for high-alloyed austenitic grades:

  • pressure vessels
  • heat exchangers
  • seawater handling
  • pulp bleaching
  • hydrometallurgy
  • cryogenic applications

Our high-alloyed austenitic grades achieve their enhanced resistance to corrosion and other properties by heightened levels of chromium, nickel, molybdenum and/or nitrogen, depending on the application at hand. They have good weldability and excellent formability.

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Check Stainless steel finder to browse available grades, dimensions and surface finishes by product form.
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 Grade properties

High-alloyed austenitic stainless steels differ substantially from more conventional grades with regard to resistance to corrosion and, in some cases, also mechanical and physical properties. This is mainly due to the high contents of chromium, nickel, molybdenum and nitrogen.

For more information

  • Open the Downloads tab to download Outokumpu austenitic high performance stainless steel datasheets
  • View all technical specifications online including mechanical properties, chemical composition, physical properties and corrosion characteristics.

Compare technical specifications for all Outokumpu steel grades

Online technical spec​​ifi​​cations EN ASTM
Vie​​​​w Outokumpu 4438 properties 1.4438 317  / S31703
View Outokumpu ​4439 properties ​1.4439 ​317 LMN / S31726
​View Outokumpu 725LN properties ​1.4466 UNS S31050
View Outokumpu ​904L properties 1.4539​ 904L
​View Outokumpu 254 SMO®​ properties ​1.4547 UNS S31254
View Outokumpu ​4529 properties ​1.4529 UNS N08926
View Outokumpu ​4565 properties 1.4565​ UNS S34565
​View Outokumpu 654 SMO® properties 1.4652 UNS S32654​

Compare technical specifications for all Outokumpu steel grades​​​​​​​​​​​​​​​​


High-alloyed austenitic stainless steels are highly suitable for welding. Due to high contents of chromium, nickel, molybdenum and nitrogen, their corrosion resistance and in some cases mechanical properties are superior to conventional Cr-Ni and Cr-Ni-Mo grades. From the point of view of workshop practice, the high-alloyed austenitic grades are somewhat similar to standard austenitic grades.

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 Corrosion resistance

Outokumpu high-alloyed austenitic grades provide some of the highest corrosion resistance achievable with stainless steel. The resistance to uniform corrosion and localized corrosion, including chloride and sulfide induced stress corrosion cracking, is very good. Each grade is outstanding in its distinct area.

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