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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Stainless Steel Fasteners Ltd (SSF), a leading UK manufacturer of high-integrity specialist fasteners, is the first fastener manufacturing company to be awarded NORSOK M-650 accreditation by Statoil ASA.
SSF has been qualified for the hot forging of its range of super duplex stainless steel fasteners.
Heat exchanger manufacturers usually order their tubes from mills in specific lengths. Delivery times tend to be long, which is not ideal when small quantities are needed for urgent repair jobs and maintenance.
Held from 11-14 November in Abu Dhabi, the 2012 ADIPEC again proved to be a superb platform for the oil and gas industries in the Middle East. Combining a leading conference as well as a major exhibition, the ADIPEC draws in supply companies and visitors from around the globe. Stainless Steel World used the occasion to talk to some of the alloy suppliers active in the region.
Outokumpu has supplied three supporting 60-metre long bridge arches for a pedestrian and cycling bridge being built in Sölvesborg community in the south-east part of Sweden.
Outokumpu has delivered 170 tons of specialty stainless steel for the construction of the new modern headquarters of Qatar Foundation in Education Citym outside of Doha, Qatar.
Raymond Cordewener was presented with the Duplex Excellence Award 2012 during the Duplex Seminar & Summit, which was held in Stresa (Italy) 26 & 27 September.
Synalloy Corporation announced that its Bristol Metals, LLC (BRISMET) subsidiary has been awarded a project contract by Bechtel. The project is for essential service water buried pipe replacement and is nuclear safety related.
Outokumpu has introduced duplex stainless steel for domestic water heaters in China, producing the first-ever duplex water heater tank with a local fabricator. Domestic water heaters offer vast market potential for stainless steel in China. In April 2012, a prototype hot water storage tank for domestic water heaters was successfully fabricated in China from Outokumpu’s thin duplex stainless steel sheet of grade 2304 (EN 1.4362) under the supervision of and with assistance from Outokumpu technical specialists.
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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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