Supra

Stainless steel for highly corrosive environments

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 range for highly corrosive environments

Our Supra range austenitics can be readily formed by all cold forming methods. These products are mainly used in facades, claddings, storage tanks, and heat exchangers.

All grades share common forming properties such as excellent stretch formability, a high work-hardening rate as well as an average strain ratio r of approximately 1. The stability of the austenite decreases with lower alloying element content; more martensite is formed during cold working. In addition to the chemical composition, the martensite transformation depends on the forming temperature.

Due to their high toughness and work hardening behavior, austenitic steels are more difficult to machine than carbon steels but are still comparatively easy to machine compared to more highly alloyed stainless-steel grades. 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.

Low interstitial levels and added stabilizers have made enormous improvements to the welding characteristics of ferritic stainless steels. In addition, due to their lower thermal expansion and higher thermal conductivity, distortion and buckling is much lower during welding compared to austenitic or duplex stainless steels.


Supra grades

Key products

  •  316/4401
  • 316L/4404
  • 316LN/4406
  • 316plus
  • 316L/SANS4402
  • 316/4436
  • 316L/4435
  • 316Ti/4571
  • 4429
  • 724L

Nickel-free alternative

  • 444/4521

Outokumpu Supra Edelstahlgüten

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.

Chemical composition

C 0.04

Cr 17.2

Ni 10.1

Mo 2.1

N -

Others -

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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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Standards und Zulassungen für die Kategorie Supra

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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