Stainless steel for highly corrosive environments

Supra

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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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.

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  • EN: 1.4401
  • ASTM type: 316
  • ASTM UNS: S31600
  • Microstructure: Austenitic
Typical applications
  • Heat exchangers
  • Flanges and valves
Chemical composition
  • C: 0.04
  • Cr: 17.2
  • Ni: 10.1
  • Mo: 2.1
  • N: -
  • Others : -

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.

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  • 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
Chemical composition
  • C: 0.02
  • Cr: 17.2
  • Ni: 10.1
  • Mo: 2.1
  • N: -
  • Others : -

Supra 316LN/4406 stainless steel

316L suitable for low temperatures

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  • EN: 1.4406
  • ASTM type: 316LN
  • ASTM UNS: S31653
  • Microstructure: Austenitic
Typical applications
  • Cryogenic tank
Chemical composition
  • C: 0.02
  • Cr: 17.2
  • Ni: 10.3
  • Mo : 2.1
  • N: 0.14
  • Others : -

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.

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  • EN: 1.4420
  • ASTM type : -
  • ASTM UNS: S31655
  • Microstructure: Austenitic
Typical applications
  • Process and transport tanks
  • Water treatment and pipes
  • Heat exchangers
  • Architectural applications
Chemical composition
  • C: 0.02
  • Cr: 20.3
  • Ni: 8.6
  • Mo: 0.7
  • N: 0.19
  • Others : -

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.

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  • SANS: 1.4402
  • ASTM type: -
  • ASTM UNS: -
  • Microstructure: Austenitic
Typical applications • Container tanks
Chemical composition
  • C: 0.02
  • Cr: 17.2
  • Ni: 10.1
  • Mo: 2.1
  • N: -
  • Others: -

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.

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  • EN: 1.4436
  • ASTM type: 316
  • ASTM UNS: S31600
  • Microstructure: Austenitic
Typical applications
  • Pulp and paper industry equipment
  • Pharmaceutical industry equipment
  • Flanges and valves
Chemical composition
  • C: 0.04
  • Cr: 16.9
  • Ni: 10.7
  • Mo: 2.6
  • N: -
  • Others: -

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.

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  • EN: 1.4435
  • ASTM type: 316L
  • ASTM UNS: S31603
  • Microstructure: Austenitic
Typical applications
  • Urea plants
  • Pulp and synthetic fiber plants
  • Flanges and valves
  • Cryogenic
  • Hydrogen
Chemical composition
  • C: 0.02
  • Cr: 17.3
  • Ni: 12.6
  • Mo : 2.6
  • N: -
  • Others : -

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.

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  • EN: 1.4571
  • ASTM type: 316Ti
  • ASTM UNS: S31635
  • Microstructure: Austenitic
Usage
  • Flue gas applications
  • Flanges and valves
Chemical composition
  • C: 0.04
  • Cr: 16.8
  • Ni: 10.9
  • Mo: 2.1
  • N: -
  • Others: Ti

Supra 4429 stainless steel

A special 316L with increased content of Nitrogen and Molybdenum

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  • EN: 1.4429
  • ASTM type: 316LN
  • ASTM UNS: S31653
  • Microstructure: Austenitic
Typical applications
  • Pharmaceutical
  • Chemical
  • Petrochemical
  • Cryogenic
  • Cellulose
  • Food processing industries
  • Hydrogen
Product forms
Chemical composition
  • C: 0.02
  • Cr: 17.2
  • Ni: 12.2
  • Mo: 2.6
  • N: 0.15
  • Others: -

Supra 724L stainless steel

A modified version of 4435 for Urea applications

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  • 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: -

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.

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  • EN: 1.4521
  • ASTM type: 444
  • ASTM UNS: S444000
  • Microstructure: Ferritic
Typical applications
  • Hot water tanks
  • Drinking water pipes
Chemical composition
  • C: 0.02
  • Cr: 18.0
  • Ni: -
  • Mo: 2.04
  • N: -
  • Others: Nb,Ti

Circle Green Supra 316L/4404 stainless steel

Circle Green 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. Circle Green 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.

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  • 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
Chemical composition
  • C: 0.02
  • Cr: 17.2
  • Ni: 10.1
  • Mo: 2.1
  • N: -
  • Others : -

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For Highly Corrosive Environments

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.

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

Outokumpu Supra range downloads

Outokumpu Supra range datasheet
Machining guidelines for standard austenitic stainless steel grades
Outokumpu 4622 and 316plus brochure
Outokumpu Product Ranges chart