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 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.
A long-term strategic alliance has been established between Caprari and Peme Gourdin, two European manufacturers specialized in water centrifugal pumps. As a result of the strongly complementary sales networks, markets and products of the two concerns, this new partnership will provide fresh opportunities for Caprari customers who will be able to count on an alternative and even wider choice of products, pumping solutions and services, than the already comprehensive range developed during almost 70 years of history and experience in the sector.
Air valves are normally required on piping systems, for example, offshore fire fighting systems, to vent air from a pipeline/riser on pump start-up and admit air back into the system under vacuum conditions. Often they are overlooked, yet play a crucial role within a pipe/pump system. It is important that they are correctly specified with their function, size and location to help in ensuring that the system is operating efficiently.
NSSC (Nippon Steel & Sumikin Stainless Steel Corporation) has successfully developed NSSC2120 (21Cr-2Ni-N), the world’s first type 304 substituting type lean duplex stainless steel with high heat-input weldability.
Hamilton Metals, one of the largest stocking distributors of Corrosion Resistant Alloys (CRA) for the exploration and production industry, has opened a new stocking facility in Edmonton, Alberta.
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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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.