Forta

Duplex and other high strength stainless steel

Browse Forta range specifications Visit Stainless Steel Finder

The Forta range contains the following: Duplex, H-Series and temper rolled austenitic and ferritic products. These high strength stainless steels enable thinner structures and weight reduction.

High strenght stainless steels

Forta is associated with strength. This range covers the strongest stainless steels in our portfolio. It brings together three product groups: Forta Duplex products, Forta H-Series fully austenitic products for high strength and high ductility and Forta Temper rolled products for high strength and high hardness.

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Forta

The Forta range contains duplex, H-Series and temper rolled austenitic and ferritic stainless steels that enable thinner structures and weight reduction (measured in Rp0.2 > 350 MPa. PRE 16 - 43). 

Duplex (austenitic-ferritic) stainless steel combines many of the best properties of austenitic and ferritic stainless steels: high strength, good corrosion resistance and enhanced resistance to stress- corrosion cracking (Rp0.2 > 400 MPa. PRE 26 - 43).

Forta DX 2205 (EN 1.4462) is the most well-known duplex product, offering very good resistance to uniform and localized corrosion and stress- corrosion cracking in combination with high mechanical strength. Super duplex Forta SDX 2507 (EN 1.4410), with higher corrosion resistance and mechanical strength than Forta DX 2205, is often used in extremely corrosive environments such as desalination, chemical or offshore subsea applications.

H-series are manganese containing fully austenitic stainless steels with high strength and high ductility (Rp0.2 > 400 MPa. PRE  21). Forta H400 (EN 1.4376) with lower nickel content has higher strength than standard austenitic stainless steels 304/304L and is a cost-effective solution for automotive lightweight applications.

Forta H500 (EN 1.4678) has a fully austenitic and non-magnetizable microstructure with significant strain-hardening due to twinning. With a yield strength higher than 500 MPa, it is a perfect lightweight alternative for safety- relevant components in the automotive and transportation industry. 

Temper-rolled stainless steels have high strength and high hardness (Rp0.2 > 350 MPa. PRE 16 - 25). Temper rolling means a controlled additional cold rolling process that is applied to standard austenitic and ferritic stainless steels and it increases the strength and surface hardness of the steels. The strength classification includes yield strength classes from CP350 up to CP1100 MPa and tensile strength classes from C700 up to C1900 MPa.

Temper-rolled austenitic stainless steel Forta 301/4310 (EN 1.4310) can reach the highest strength class. Forta H800 (EN 1.4678) and Forta H1000 (EN 1.4678) are the temper-rolled condition of Forta H500 and still non-magnetic. They offer higher resistance for crash-relevant parts and a cost-effective and price-stable solution in the automotive industry. 

See the full list of Forta grades below

Outokumpu Forta grades

Forta DX 2205

The most popular duplex product on the market. Offers very good resistance to uniform and localized corrosion and stress corrosion cracking in combination with high mechanical strength.

EN 1.4462

ASTM type -

ASTM UNS S32205

Microstructure Duplex

Typical applications

  • Cargo tanks in chemical tankers
  • Pulp and paper industry applications such as digesters and process tanks
  • Oil and gas industry applications such as flanges, tubes, and pipes
  • Structural components in bridges
  • Flanges and valves

Product forms

Datasheet

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

Chemical composition, % by mass

C 0.02

Cr 22.4

Ni 5.7

Mo 3.1

N 0.17

Others -

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Forta LDX 2101

A lean-alloyed duplex product with good resistance to localized and uniform corrosion, as well as stress corrosion cracking, making it a good substitute for coated carbon steel in e.g. structural components and storage tanks. Also offers high mechanical strength and good machinability.

EN 1.4162

ASTM type -

ASTM UNS S32101

Microstructure Duplex

Typical applications

  • Storage tanks
  • Household heaters
  • Structural components for floodgates and bridges, or rebar for concrete structures
  • Pulp and paper industry applications such as digesters and components for paper machines
  • Flanges and valves

Product forms

Datasheet

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

Chemical composition, % by mass

C 0.03

Cr 21.5

Ni 1.5

Mo 0.3

N 0.22

Others 5 Mn Cu

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Forta DX 2304

A duplex product with a leaner alloying composition than Forta DX 2205. It has good resistance to localized and uniform corrosion, as well as stress corrosion cracking, combined with high mechanical strength.

EN 1.4362

ASTM type -

ASTM UNS S32304

Microstructure Duplex

Typical applications

  • Pulp and paper industry applications
  • Blast walls on oil platforms
  • Flanges and valves

Product forms

Datasheet

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

Chemical composition, % by mass

C 0.02

Cr 23.0

Ni 4.8

Mo 0.3

N 0.10

Others Cu

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Forta EDX 2304

An enhanced version of Forta DX 2304 with better corrosion resistance and higher mechanical strength.

EN 1.4362

ASTM type -

ASTM UNS S32304

Microstructure Duplex

Typical applications

  • Offshore topside structural components
  • Tank applications
  • Flanges and valves

Product forms

Datasheet

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

Typical chemical composition, % by mass

C

0.02

Cr 23.8

Ni 4.3

Mo 0.5

N 0.18

Others Cu

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Forta LDX 2404

A low-nickel, high-nitrogen duplex product with higher mechanical strength than Forta DX 2205. Offers very good resistance to localized and uniform corrosion, as well as stress corrosion cracking.

EN 1.4662

ASTM type -

ASTM UNS S82441

Microstructure Duplex

Typical applications

  • Storage tanks
  • Structural components for flood and sluice gates
  • Mining industry applications such as dewatering equipment
  • Flanges and valves

Product forms

Datasheet

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

Typical chemical composition, % by mass

C 0.02

Cr 24.0

Ni 3.6

Mo 1.6

N 0.27

Others 3Mn Cu

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Forta SDX 100

A super duplex product with higher corrosion resistance and mechanical strength than Forta DX 2205. Often used in extremely corrosive environments such as desalination, chemical, or offshore subsea applications.

EN 1.4501

ASTM type -

ASTM UNS S32760

Microstructure Duplex

Typical applications

  • Desalination plants
  • Industrial piping
  • Scrubbers
  • Tubular products for oil and gas applications
  • Deep-sea pipelines
  • Flanges and valves

Product forms

Datasheet

Download Forta duplex range datasheet

Chemical composition

C 0.02

Cr 25.4

Ni 6.9

Mo 3.8

N 0.27

Others W Cu

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Forta SDX 2507

A super duplex product with higher corrosion resistance and mechanical strength than Forta DX 2205. Often used in extremely corrosive environments such as desalination, chemical, or offshore subsea applications.

EN 1.4410

ASTM type -

ASTM UNS S32750

Microstructure Duplex

Typical applications

  • Desalination plants
  • Industrial piping
  • Scrubbers
  • Tubular products for oil and gas applications
  • Deep-sea pipelines
  • Flanges and valves

Product forms

Datasheet

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

Typical chemical composition, % by mass

C 0.02

Cr 25

Ni 7.0

Mo 4.0

N 0.27

Others -

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Forta H400

Forta H400 has higher strength than standard 304/4301 and a lower nickel content, making it a cost-effective and lightweight austenitic product for the automotive industry. It has been used in automotive applications for over 10 years.

EN 1.4376

ASTM type -

ASTM UNS -

Microstructure Austenitic

Usage

  • Cross members
  • Strut domes
  • Bumpers

Product forms

Datasheet

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

Typical chemical composition, % by mass

C 0.04

Cr 17.5

Ni 4.0

Mo -

N 0.20

Others 6.8Mn

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Forta 430/4016

A classic 16% chromium ferritic stainless steel used in mildly corrosive environments.

EN 1.4016

ASTM type 430

ASTM UNS S43000

Microstructure Ferritic

Typical applications

  • Automotive components
  • Structural applications
  • Tanks

Product forms

Datasheet

Download Forta range datasheet

Typical chemical composition, % by mass

C 0.05

Cr 16.2

Ni -

Mo -

N -

Others -

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Forta 301LN/4318

A low-carbon, nitrogen alloyed alternative to Forta 301/4310.

EN 1.4318

ASTM type 301LN

ASTM UNS S30153

Microstructure Austenitic

Typical applications

  • Vehicle chassis
  • Profiles

Product forms

Datasheet

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

Typical chemical composition, % by mass

C 0.02

Cr 17.7

Ni 6.5

Mo -

N 0.14

Others -

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Forta 301/4310

A lower chromium and nickel alternative to Forta 304/4301 with high work hardening capacity.

EN 1.4310

ASTM type 301

ASTM UNS S30100

Microstructure Austenitic

Typical applications

  • Automotive components
  • Cable connectors
  • Springs
  • Window frames
  • Commercial appliances

Product forms

Datasheet

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

Typical chemical composition, % by mass

C

0.10

 

Cr 17.0

Ni 7.0

Mo -

N -

Others -

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Forta 304/4301

Forta 304/4301 is a classic 18% chromium, 8% nickel austenitic stainless steel. It’s an all-purpose product with good corrosion resistance and is suitable for a wide variety of applications.

EN 1.4301

ASTM type 304

ASTM UNS S30400

Microstructure Austenitic

Typical applications

  • Beer kegs
  • Cutlery
  • Automotive components
  • Tanks and vessels
  • Furniture
  • Structural applications

Product forms

 

Datasheet

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

Typical chemical composition, % by mass

C 0.04

Cr 18.1

Ni 8.1

Mo -

N -

Others -

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Forta 304L/4307

Forta 304L/4307 is a low-carbon alternative to Forta 304/4301 and is suitable for a wide variety of applications.

EN 1.4307

ASTM type 304L

ASTM UNS S30403

Microstructure Austenitic

Typical applications

  • Beer kegs
  • Cutlery
  • Automotive components
  • Tanks and vessels
  • Furniture
  • Structural applications

Product forms

Datasheet

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

Typical chemical composition, % by mass

C 0.02

Cr 18.1

Ni 8.1

Mo -

N -

Others -

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Forta 316/4401

A normal-carbon alternative to Forta 316L/4404 that is widely used for various applications.

EN 1.4401

ASTM type 316

ASTM UNS S31600

Microstructure Austenitic

Typical applications

  • Automotive components
  • Tanks and vessels

Product forms

Datasheet

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

Typical chemical composition, % by mass

C 0.04

Cr 17.2

Ni 10.1

Mo 2.1

N -

Others -

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Forta 316L/4404

A normal-carbon alternative to Forta 316L/4404 that is widely used for various applications.

EN 1.4404

ASTM type 316L

ASTM UNS S31603

Microstructure Austenitic

Typical applications

  • Automotive components
  • Tanks and vessels

Product forms

Datasheet

Download Forta range datasheet for more information on corrosion resistance, mechnanical properties, physical properties and fabrication

Typical chemical composition, % by mass

C 0.02

Cr 17.2

Ni 10.1

Mo 2.1

N -

Others -

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Forta 316plus

Forta 316plus is a cost-efficient, 21Cr lower-nickel/molybdenum alternative to traditional molybdenum austenitics like Forta 316L/4404.

EN 1.4420

ASTM type -

ASTM UNS S31655

Microstructure Austenitic

Typical applications

  • Automotive components
  • Tanks and vessels

Product forms

Data sheet

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

Typical chemical composition, % by mass

C 0.02

Cr 20.3

Ni 8.6

Mo 0.7

N 0.19

Others -

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Forta 316Ti/4571

A titanium-stabilized, molybdenum-alloyed austenitic alternative to Forta 316L/4404 – mainly used in Germany.

EN 1.4571

ASTM type 316Ti

ASTM UNS S32100

Microstructure Austenitic

Typical applications

  • Heating technology
  • Profiles

Product forms

Datasheet

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

Typical chemical composition, % by mass

C 0.04

Cr 16.8

Ni 10.9

Mo 2.1

N -

Others Ti

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Go directly to Outokumpu Forta grades

Standards and approvals

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
      

Forta DX 2304, Forta DX 2205, and Forta SDX 2507 are listed in EN 10028-7:2007.

European material approval EAM 0045-01:2012/01 for Forta LDX 2101 is available for cold rolled 0.5-6.4 mm and hot rolled 3.0–10.0 mm.

In ASME II-D 2013, Forta DX 2205 (S31803 and S32205). Forta EDX 2304 (S32304), Forta SDX 100 (S32760) and Forta SDX 2507 (S32750) are listed for general use in the temperature range -30 – 316 °C. Data for Forta LDX 2101 and Forta LDX 2404 can be found in ASME code case 2418-1 and 2780 respectively.


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
  • Pressure Equipment Directive (PED)

Forta range use cases and articles

Lue lisää

Case Maastank

Duplex delivers for Port of Rotterdam storage tanks

Article

Building sustainable marine structures with duplex stainless steel

Article

What Nynäshamn bridge tells us about the durability of stainless steel

Webinar

Insights and best practices of tank fabrication

Webinar

How material selection and design work hand-in-hand

Article

How switching to duplex stainless steel saves weight on offshore platforms

Webinar

Sustainable tank solutions of today

Technical article

Forta H-Series - the attractive non-magnetic material for EV motors

Article

Duplex storage tanks excel in a range of different environments

Outokumpu Forta range downloads

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