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.
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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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RathGibson, a manufacturer of welded, welded and drawn, and seamless stainless steel, nickel, and titanium tubing, offers seamless stainless steel tubing through Greenville Tube Co. located in Clarksville, Arkansas, USA.
Sandvik has increased the range of heavy wall pipes available as part of its standard stock program, with the duplex stainless steel heavy wall pipes in Sandvik SAF 2205.
RathGibson, a manufacturer of welded, welded and drawn, and seamless stainless steel, nickel, and titanium tubing, has incorporated an in-line U-Bend manufacturing center into their Janesville, Wisconsin facility.
Outokumpu’s plate prefabrication and surface-treatment capabilities have been put to work on two 9400dwt full-stainless steel chemical tankers under construction for the Italy-based shipowner Finbeta SpA.
Outokumpu has been chosen as the exclusive supplier of stainless steel piping for an extensive modernization and expansion at the Mondi Syktyvkar pulp and paper mill complex in Russia.
Outokumpu is the exclusive supplier of stainless steel piping for an extensive modernization and expansion at the Mondi Syktyvkar pulp and paper mill complex in Russia, in a rare direct supply to an end user within the industry.
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.
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