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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.

Discover the latest innovations in duplex technology with our exclusive Duplex World Update. Download this comprehensive 3-part series now and gain valuable insights from industry experts on groundbreaking applications and developments in duplex material science.

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.

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SSW America 2004: call for papers

Stainless Steel World is organising a conference and exhibition dedicated to the use of corrosion-resistant alloys, and welcomes your participation through the submission of papers for oral presentation as well as poster contributions.

Kitz to include wider range of alloys

Kitz Corporation has announced that its integrated production system will include a host of additional stainless steel and high-alloy steel valve castings.

Offshore sampling

A Jiskoot fastloop sampling system has been selected for installation at a Shell offshore platform in Malaysia.

Duplex valves for flue gas applications

The Stainless Valve Company has fabricated two 48" valves for flue gas application, made in duplex stainless steel 2205.

Solent & Pratt wins Kristin contract

Solent & Pratt (Brecksville, Ohio, USA) has been awarded a contract by Statoil of Norway to provide high performance butterfly valves and actuators for the Kristin Offshore Platform Project engineered and constructed by Aker-Kvearner of Oslo, Norway.

Sulzer supplies Bonga oilfield

Sulzer Pumps Ltd has built 22 pumps of different types at its Leeds factory for installation on a Korean-built, floating oil production vessel in Wallsend.

UK source for pipes

The production facilities for the manufacture of specialist formed and welded pipes previously supplied by Bentham International have been taken over by the Angle Ring Co. Ltd (Tipton, UK).

Super duplex pump

The Port Klang Power Station in Malaysia routinely faced "unacceptable" costs associated with downtime on their existing pumps.

Sandvik supplies Nigerian gas field

Sandvik Steel has produced its first high-volume order for large diameter stainless steel tubes for gas lift risers (GLR).

Sandvik supplies duplex to W. Africa

Sandvik Steel has received orders for nearly half a million metres of duplex stainless steel tubing, for hydraulic and chemical injection lines for subsea umbilical cables, for ExxonMobil's Kizomba project and the Zafiro project, both in West Africa.

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.

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.