Supra

Stainless steel for highly corrosive environments

Browse Supra range specifications. Visit Stainless Steel Finder

The Supra range contains stainless steel products designed for highly corrosive environments. Our Supra range stainless steels have a good resistance to uniform corrosion in many organic and inorganic chemicals.

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Supra

The Supra range contains austenitic and ferritic stainless steels grades for medium to highly corrosive environments in PRE range 22 – 26.

The most widely used molybdenum alloyed austenitic stainless grade, Supra 316L/4404 (EN 1.4404) , defines the overall landscape of the Supra range. The Supra range is complemented by a modern stabilized molybdenum alloyed nickel-free 18% chromium ferritic stainless steel alternative, Supra 444/4521 (EN 1.4521).

The latest Supra range addition is the austenitic Supra 316plus/4420 (EN 1.4420). Thanks to higher chromium and nitrogen, Supra 316plus has higher corrosion resistance and strength compared to 316L. 

Supra range Cr-Ni-Mo austenitic stainless steels have excellent corrosion resistance, welding and forming, especially stretch-forming characteristics. Austenitic steels exhibit very high ductility also down to cryogenic temperatures. Due to the higher toughness and work hardening nature of austenitic stainless steels, special attention may be needed during forming and machining compared to ferritic stainless or carbon steels.

Modern Supra range stabilized molybdenum alloyed ferritic stainless steel, Supra 444/4521, has excellent corrosion resistance, welding and deep-drawing properties. Nickel-free ferritic stainless steels grades have excellent resistances to chloride-induced stress-corrosion cracking. Ferritics have good heat transfer properties that can be utilized in applications where uniform and fast heat transfer is preferred. Good heat transfer with lower thermal expansion eases weldability via smaller weld distortion and buckling behavior than austenitics. In addition, ferritics have similar machinability as carbon streels, due to low work hardening characteristics.  

Supra range grades can be used in a wide range of applications supported with a broad selection of surface finishes from mills and service centers.

See full list of Supra grades below

Outokumpu Supra grades

Supra 316/4401 stainless steel

Supra 316/4401 is a widely used Molybdenum alloyed austenitic stainless steel. It’s an all-purpose product with very good corrosion resistance and is suitable for a wide variety of applications that require good formability and weldability. Supra 316/4401 can be delivered with a variety of surface finishes.

EN 1.4401

ASTM type 316

ASTM UNS S31600

Microstructure Austenitic

Typical applications

  • Heat exchangers
  • Flanges and valves

Datasheet

Outokumpu Supra range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication.

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Supra 316L/4404 stainless steel

Supra 316L/4404 is a low-carbon alternative to Supra 316/4401. The lower carbon content minimizes carbide precipitation as a result of heat input, for example during welding, giving improved resistance against intergranular corrosion.Supra 316L/4404 is suitable for a wide variety of applications that require good formability and weldability, and can be delivered with a variety of surface finishes.

EN 1.4404

ASTM type 316L

ASTM UNS S31603

Microstructure Austenitic

Typical applications

  • Chemical industry
  • Petrochemical industry
  • Pulp and paper industry
  • Textile industry
  • Food and beverage industry
  • Pharmaceutical industry
  • Medical applications
  • Flanges and valves

Datasheet

Download Supra range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

Chemical composition

C 0.02

Cr 17.2

Ni 10.1

Mo 2.1

N -

Others -

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Supra 316LN/4406 stainless steel

316L suitable for low temperatures

EN 1.4406

ASTM type 316LN

ASTM UNS S31653

Microstructure Austenitic

Typical applications

  • Cryogenic tank

Chemical composition

C

0.02

 

Cr 17.3

Ni 12.6

Mo 2.6

N -

Others -

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Supra 316plus stainless steel

Supra 316plus is the highest strength stainless steel in the Supra range. It is a cost-efficient, 21Cr lower-nickel/molybdenum alternative to traditional molybdenum austenitics like Supra 316L. This product has good formability, excellent weldability, and is usable in cryogenic applications.

EN 1.4420

ASTM type -

ASTM UNS S31655

Microstructure Austenitic

Typical applications

  • Process and transport tanks
  • Water treatment and pipes
  • Heat exchangers
  • Architectural applications

Datasheet

Download Supra range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

Chemical composition

C 0.02

Cr 20.3

Ni 8.6

Mo 0.7

N 0.19

Others -

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Supra 316L/SANS4402 stainless steel

Supra 316L/SANS4402 is a high-strength, high-formability product often used in container transports and where there is an elevated temperature requirement.

SANS 1.4402

ASTM type -

ASTM UNS -

Microstructure Austenitic

Typical applications

• Container tanks

Datasheet

Download Supra range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

Chemical composition

C 0.02

Cr 17.2

Ni 10.1

Mo 2.1

N -

Others -

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Supra 316/4436 stainless steel

Supra 316/4436 is a product with high resistance to non-oxidizing acids and chloride-containing media due to higher molybdenum content. It has good formability and weldability.

EN 1.4436

ASTM type 316

ASTM UNS S31600

Microstructure Austenitic

Typical applications

  • Pulp and paper industry equipment
  • Pharmaceutical industry equipment
  • Flanges and valves

Datasheet

Download Supra range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

Chemical composition

C 0.04

Cr 16.9

Ni 10.7

Mo 2.6

N -

Others -

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Supra 316L/4435 stainless steel

Supra 316L/4435 is a alternative to 316L/4404 with higher molybdenum and nickel content for enhanced corrosion resistance and formability.

EN 1.4435

ASTM type 316L

ASTM UNS S31603

Microstructure Austenitic

Typical applications

  • Urea plants
  • Pulp and synthetic fiber plants
  • Flanges and valves

Datasheet

Download Supra range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

Chemical composition

C

0.02

 

Cr 17.3

Ni 12.6

Mo 2.6

N -

Others -

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Supra 316Ti/4571 stainless steel

Supra 316Ti/4571 is a titanium-stabilized alternative to Supra 316L/4404 – mainly used in Germany for elevated temperature applications. Due to its titanium-stabilization this product is weldable in all thickness ranges.

EN 1.4571

ASTM type 316Ti

ASTM UNS S31635

Microstructure Austenitic

Usage

  • Flue gas applications
  • Flanges and valves

Datasheet

Download Supra range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

Chemical composition

C 0.04

Cr 16.8

Ni 10.9

Mo 2.1

N -

Others Ti

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Supra 4429 stainless steel

A special 316L with increased content of Nitrogen and Molybdenum

EN 1.4429

ASTM type 316LN

ASTM UNS S31653

Microstructure Austenitic

Typical applications

  • Pharmaceutical
  • Chemical
  • Petrochemical
  • Cryogenic
  • Cellulose
  • Food processing industries

Chemical composition

C 0.02

Cr 18.0

Ni -

Mo 20

N -

Others Nb,Ti

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Supra 724L stainless steel

A modified version of 4435 for Urea applications

EN 1.4435

ASTM type 316L

ASTM UNS S31603

Microstructure Austenitic

Typical applications

  • Urea reactors

Chemical composition

C 0.02

Cr 17.3

Ni 12.6

Mo 2.6

N -

Others -

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Supra 444/4521 stainless steel

Supra 444/4521 is a nickel-free molybdenum-alloyed ferritic stainless steel with very good corrosion resistance, good cold formability and high strength. It allows for thinner walls in tanks and is not prone to stress corrosion cracking.

EN 1.4521

ASTM type 444

ASTM UNS S444000

Microstructure Ferritic

Typical applications

  • Hot water tanks
  • Drinking water pipes

Datasheet

Download Supra range datasheet for more information on corrosion resistance, mechanical properties, physical properties and fabrication.

Chemical composition

C 0.02

Cr 18.0

Ni -

Mo 20

N -

Others Nb,Ti

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Go directly to Outokumpu Supra grades

Standards and approvals for Supra range

EN ISO 18286     Hot-rolled stainless steel plates – Tolerances on dimensions and shape  
EN 10051 Hot-rolled steel strip.
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. 
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 


 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 – semi-finished products, bars, rods sections for general purposes
 EN 10088-4  Technical delivery conditions for sheet/plate and strip
 EN 10088-5  Technical delivery conditions for bars, rods wire, sections and bright products of corrosion resisting steels for construction purposes
 EN 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  Cr and Cr-Ni stainless steel plate, sheet and strip for pressure vessels
 ASTM A276  Stainless steel and heat resisting steel bars and shapes
 ASTM A479/479M  Stainless steel bars for boilers/pressure vessels
 ASTM A493  Stainless steel and heat-resisting steel rod and wire for cold heading and forging
 ASTM A555  General requirements for stainless and heat resistant steel wire and wire rod
 ASTM A 666  Austenitic stainless steel sheet, strip, plate, bar for structural and architectural applications
 ASME IIA  Materials. Part A – Ferrous Material Specifications
      

Outokumpu meets the most common certifications and approvals around the world, including:

  • AD 2000 Merkblatt
  • Approval of Material Manufacturers
  • Factory Production Control Certificate
  • ISO 9001
  • ISO 14001
  • ISO 50001
  • ISO/TS 16949
  • NORSOK
  • OHSAS 18001

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