​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Outokumpu Supra range

​Highly corrosive environments​​

  • ​​Stainless steels f​or highly corrosive environments (PRE 22 to 27)
  • Austenitics are highly formable and weldable and used in claddings, storage tanks, and heat exchangers
  • Includes the well-known Outokumpu Supra 316L/4404 as well as several alternatives
  • Ferritic stainless steels are nickel free, have good formability, and can be used in applications with elevated temperatures​​​

Key product
Supra 316L/4404
Supra 316/4401
Supra 316plus
Supra 316L/SANS4402
Supra 316L/4432
Supra 316/4436
Supra 316L/4435
Supra 316Ti/4571
Supra 444/4521
Typical applications
Chemical industry
Petrochemical industry
Pulp and paper industry
Textile industry
Food and beverage industry
Pharmaceutical industry
Medical applications

​Comp​are product performance​

​Pro​duct properties​

 Corrosion resistance

Outokumpu Supra range products have excellent corrosion resistance and are suitable for a wide range of applications. Outokumpu Supra range stainless steels have a good resistance to uniform corrosion in many organic and inorganic chemicals. The addition of molybdenum enhances the alloy’s corrosion resistance in many acidic environments.

For more information

​Check Stainless Steel Finder to find corrosion information by products in the Outokumpu Supra range​

Check the online corrosion tables and search by chemical name, formula corrosion rates or alphabetically for stainless steel products.

Find an Outokumpu sales office near you to get the ​printed version of the Outokumpu Corrosion Handbook​​​​​​​​​



Outokumpu Supra range austenitics can be readily formed by all cold forming methods. All products share common forming properties including excellent stretch formability, a high work hardening rate and an average strain ratio of approximately one.

The ferritic stainless steel Supra 444/4521 can be formed using typical forming processes like folding, bending, and drawing. It has higher minimum Yield strength than a standard austenitic stainless steel like Supra 304/4301 in combination with lower work hardening behavior.


Due to their high toughness and work hardening behavior, austenitic steels are more difficult to machine than carbon steels but are still comparatively easy compared to more highly alloyed stainless steel products. They require higher cutting forces than carbon steels, show resistance to chip breaking, and have a high tendency to built-up edge formation. The best machining results are obtained by using high-power equipment, sharp tooling, and a rigid set-up.


​Outokumpu Supra range austenitic stainless steels have excellent weldability and are suited to a full range of conventional welding methods, except oxyacetylene. For the ferritic stainless steel Supra 444/4521, conventional welding methods and filler materials applied to austenitic 300­series can be used. Heat input in welding should been kept to a minimum.​​

More information is available in the Outokumpu Welding Handbook, available from our Outokumpu sales offices

 Forms & dimensions

The available forms for Outokumpu Supra range products can include:
To see the forms available for a specific product or to get information about dimensions, check Stainless Steel Finder​​​​​​​​

 Standards and approvals


​Flat products

  • ​​EN ISO 18286 Hot-rolled stainless steel plates – Tolerances on dimensions and shape
  • EN 10051 Hot-rolled steel strip. Tolerances ​
  • EN 10088-1 Stainless steels – list of stainless steels
  • ISO 15510 Stainless steels – chemical composition
  • EN ISO 9445 Cold-rolled stainless narrow strip, ​wide strip, plate/sheet and cut lengths. Tolerances
  • ASTM A 480 General requirements for flat-rolled stainless and heat resisting steel
  • ASTM A 959 Harmonized standard grade compositions for wrought stainless steels
  • ASME IID Materials – Physical properties tables


​Flat and long products

  • ​​EN 10028-7 Flat products for pressure purposes – Stainless steels
  • EN 10088-2 Stainless steels – sheet/plate and strip for general 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
  • AEN 10095 Heat resisting steels and nickel alloys
  • EN 10151 Stainless steel strip for springs
  • EN 10302 Creep resisting steels, nickel and cobalt alloys
  • ASTM A 167 Stainless and heat-resisting Cr-Ni steel plate, sheet, and strip
  • ASTM A 176 Stainless and heat-resisting Cr steel plate, sheet, and strip
  • ASTM A 240 Heat-resisting Cr and Cr-Ni stainless steel plate, sheet and strip for pressure vessels
  • ASTM A 666 Austenitic stainless steel sheet, strip, plate, bar for structural and architectural applications
  • ASME IIA Materials. Part A – Ferrous Material Specifications

Certificates and approvals

  • ​​AD 2000 Merkblatt
  • Approval of Material Manufacturers
  • Factory Production Control Certificate
  • ISO 9001
  • ISO 14001
  • ISO 50001
  • ISO/TS 16949
  • OHSAS 18001
  • Pressure Equipment Directive (PED)



  • Range brochure​​​​​​​ (.pdf) ​​​
  • Range datasheet​​​​​​​ (.pdf) ​​​

 Customer views



No chance for germshttp://www.outokumpu.com/en/stainless-news/cases/no-chance-for-germsNo chance for germsJouni LievonenCEO of Kavika Outokumpu is the natural choice for us. If any problems emerge, for example, Outokumpu can provide technical support, which we regard as very important.
Beauty prevails amid desert sands in Kuwaithttp://www.outokumpu.com/en/stainless-news/cases/beauty-prevails-amid-desert-sands-in-kuwaitBeauty prevails amid desert sands in Kuwait
Outokumpu supplies stainless steel for China Resources’ innovative skyscraper in Shenzhenhttp://www.outokumpu.com/en/stainless-news/cases/outokumpu-supplies-stainless-steel-for-china-resources-innovative-skyscraper-in-shenzhenOutokumpu supplies stainless steel for China Resources’ innovative skyscraper in Shenzhen
Bailey of Sheffield jewellery lasts more than a lifetimehttp://www.outokumpu.com/en/stainless-news/cases/bailey-of-sheffield-jewelleryBailey of Sheffield jewellery lasts more than a lifetimeScott BaileyFounder, Bailey of SheffieldI liked the idea of being in Sheffield and manufacturing something out of stainless steel, because this is where the material originates from. The provenance has such a great heritage and a long history in making things.

Stainless steel finder

Stainless Steel Finder is a tool for easily comparing and finding details of all Outokumpu stainless steel grades​​​​

Go to Steel Finder