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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The small Basque city of Zumaia is located at the junction of two rivers that flow into the Bay of Biscay. The rivers slice through the city, so one crucial part of the development program is a footbridge to improve accessibility.
Al Hassan Engineering Co. SAOG (AHEC) has received a multi-million dollar contract for the Burhan West and Harmal pipeline project from the Omani government gas department.
Outokumpu, a manufacturer of duplex stainless steel, has awarded Accenture a 5 year application outsourcing contract to provide Outokumpu with application development and application management services for its enterprise resource planning system on a global basis.
Arcos Industries LLC, located in Mt. Carmel, Pennsylvania, now offers new bare wire and covered stainless steel electrodes, Arcos 2209, which are designed for joining 22% chromium duplex stainless steels including 2205.
Rolled Alloys Inc., a manufacturer of duplex stainless steel, has elected Mr Paul K Whitcraft director of quality, safety and engineering as the chairman of the 2009 ASTM International board of directors.
RathGibson, a manufacturer of welded, welded and drawn, and seamless stainless steel, nickel, duplex, and titanium tubing has appointed Michael Schwartz to the position of Chief Executive Officer (CEO).
ESAB Welding & Cutting Products has introduced a new friction stir welding system designed to weld high melting temperature materials, including ferrous alloys such as ferritic steels, stainless and duplex stainless steels, and nickel base alloys.
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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