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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VDM Metals Group, a German manufacturer of nickel alloys and special stainless steels, has adopted Henkel´s next-generation nitric acid (HNO3) free Bonderite C-CP (Cleanox) pickling process for dedicated wire products.
Stadler and Azienda Transporti Milanesi S.p.A. (ATM) have signed a framework agreement for the supply of up to 80 TRAMLINK trams for the city of Milan.
Amarinth has succeeded against the many challenges posed by Covid-19 to achieve an on-time delivery of four high-capacity pumps to a producing oil field, Equatorial Guinea.
Additive manufacturing (AM) processes are rapidly maturing and offer the capability to build a new generation of components with complex designs, enhanced functionality, and rapid repair of existing components.
The Perth division of Special Piping Materials was established in 2006 and since then the team has developed a very well-deserved reputation for efficient, reliable, and high-quality service.
Recently, Neway was officially awarded the contract to supply manual & actuated Ball, GGC, and Butterfly valves with stainless steel, duplex, super duplex, and titanium materials for a major renewable energy - offshore wind project in Northern Europe.
Outokumpu is celebrating 90 years since duplex stainless steel made its debut on the world market. The global leader in stainless steel is using the opportunity to highlight the growing role of duplex grades in supporting sustainability.
Kobe Metal has extended the exclusive agreement with Nantong Special Steel/Zhongxing Energy to include the North American, European, and Middle East markets.
Tan Naifen, Deputy Secretary-General and Director of the Statistical Information Department of China Shipbuilding Industry Association, introduced the application and development status of Chinas marine stainless steel at the Stainless Steel Online Lecture and Last Online Metal Week hosted by the Stainless Steel Branch of the China Special Steel Enterprise Association.
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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