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Duplex Stainless Steels

Duplex stainless steels have a ferritic-austenitic microstructure, in roughly equal proportions 50% ferrite and 50% austenite. Duplex combines many of the attractive properties of ferritic and austenitic stainless steels into one.

Different variants for Duplex

Duplex stainless steels are designed to provide better corrosion resistance, in particular to stress corrosion and pitting corrosion. The microstructure leads to higher strength than standard austenitic stainless steels such as Type 304 or 316. Duplex stainless steels have become more and more popular in recent years. There are several variants available, such as Duplex 2205, Superduplex 2507 or lean duplex with lower nickel content.

Solving spring cracking

Stainless Steel World Publisher - October 21, 2004

Sandvik Materials Technology's duplex stainless steel grade, Sandvik SAF 2205, is being used for wire springs in electrical contact systems on railway locomotives.

Stainless tankers

Stainless Steel World Publisher - September 27, 2004

A UK tanker manufacturer has adopted stainless steel and updated welding techniques for the manufacture of road tankers.

Bridge order for Outokumpu in Spain

Stainless Steel World Publisher - September 23, 2004

The world's first overpass bridge to be made entirely from stainless steel is to be built in Spain, using material from Outokumpu Stainless

Valves for flue gas

Stainless Steel World Publisher - June 25, 2004

Stainless Valve Company (North Carolina, USA) has supplied two of its 48" Big Knife valves for flue gas application, made in duplex stainless steel 2205.

Special Piping Materials Ltd

Stainless Steel World Publisher - June 7, 2004

Special Piping Materials has announced that on 1 June 2004 it opened an office and warehouse in Singapore to service Asia, particularly Singapore, Indonesia, Malaysia, Vietnam, Thailand and Borneo.

Long-term support for leisure flumes

Stainless Steel World Publisher - May 25, 2004

Early in 2002, Advanced Metals International supplied super duplex steel AMINOX R 255 strands to replace corroded Type 316 strands used to support flumes in leisure complexes at Clydebank and Dumbarton in Scotland.

Arcus acquires Sosta assets

Stainless Steel World Publisher - March 22, 2004

Stockholder and project supplier Arcus, based in Dordrecht, the Netherlands, has acquired the assets of German pipe manufacturer Sosta as of 1 March 2004.

Major stainless steel rebar application

Stainless Steel World Publisher - February 13, 2004

Carpenter Technology Corp., USA reports the supply of 200 tons of stainless steel reinforcing bar to The Fort Miller Co. of Schyulerville, NY.

Big knife valve

Stainless Steel World Publisher - February 10, 2004

Stainless Valve has introduced its 48" big knife valve.

Super duplex for special regulator

Stainless Steel World Publisher - February 3, 2004

Emerson Process Management has supplied Fisher pressure reducing regulators manufactured from super duplex stainless steel for a gas conditioning skid being developed by Oil and Gas Systems for a UK-based gas transmission company.

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The advantages of Duplex Stainless Steels

Corrosion Resistance: Duplex stainless steel has excellent corrosion resistance due to its high chromium and molybdenum content. It is particularly resistant to stress corrosion cracking and pitting, which makes it suitable for use in harsh environments. There are several variants available, such as Duplex 2205, Superduplex 2507 or lean duplex with lower nickel content.

Strength: Duplex stainless steel is much stronger than conventional austenitic stainless steels, which allows for thinner and lighter constructions without sacrificing durability.

Toughness: Duplex stainless steel has a high toughness, which means it is resistant to brittle fracture and impact. This property makes it suitable for use in cryogenic applications.

Cost-effectiveness: Although duplex stainless steel is more expensive than conventional austenitic stainless steels, its superior properties can lead to cost savings in the long run by reducing maintenance and downtime.

Versatility: Duplex stainless steel can be used in a wide range of applications, including chemical processing, oil and gas, marine, and pulp and paper industries. It is also used in construction and architecture due to its aesthetic appeal.

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