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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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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The strength of the chemicals sector was definitely reflected at the recent Achema show from 18-22 June 2012 in Frankfurt, Germany (info: www.achema.de). By the final day, it was clear that visitor and exhibitor numbers had remained stable: during the five days, 167,000 participants visited some 3,773 booths, occupying 136,400 m² of floor space. And with almost 50% foreign exhibitors, this was the most international Achema ever. The Stainless Steel World TV Team spent a couple of days in Frankfurt, interviewing standholders with a clear interest in corrosion resistant alloys.
Outokumpu LDX 2101® material has been officially approved for use when building pressure equipment. Fabricators can refer to the European Approval of Material (EAM) to show conformity with the European Pressure Equipment Directive (PED) when using flat LDX 2101® ≤10 mm.
Arab Steel reported that a boost in orders for new ships and offshore oil rigs in 2012 will result in greater steel consumption at two of the largest shipbuilding yards in the Gulf Cooperation Council.
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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