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.

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Super stainless steel chain

A joint venture of Sugiyama (Japan) and Cross + Morse (UK) has developed a new chain series made of super stainless steel.

Duplex productivity boost

Ongoing product development, including modifications and refinements to the steel chemistry, have enabled Sandvik Materials Technology to further enhance the machinability of Sandvik Sanmac grade SAF 2205 duplex stainless steel round bar.

Super duplex pumps

Weir Pumps has won a multi-million dollar contract to replace existing pumps at the Cantarell nitrogen generation complex located in Ciduad del Carmen, Campeche, Mexico.

New maker of high-alloy valves

SVS is a new specialty valve manufacturer located in Houston, Texas and servicing the specialty high-alloy valve markets.

Vacuum pump solutions

BOC Edwards is launching a new range of single-stage and two-stage liquid ring vacuum pumps for the evacuation of wet and dry gases.

Winn butterfly valves

The Winn Hi-Seal range of butterfly valves meets ASNI/DIN/JIS standards for fully rated applications in the marine, water, oil, gas and process industries.

Stainless chains

Renold has launched a new range of self-lubricating, stainless steel chains for applications where a clean environment and resistance to corrosion are important.

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.

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.