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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Sandmeyer Steel Co. has added 825 (UNS N08825, W. Nr. 2.4858) to its extensive line of corrosion resistant stainless steel and nickel alloy plate and plate products.
A Spain-based technology provider for the ceramics industries, has replaced a conventional austenitic grade with Outokumpu’s duplex LDX 2101® in silos for atomized clay, achieving better durability, corrosion resistance and economy.
Centro Inox has reported that the territory of the municipality of Reggio Calabria has a system of aqueducts that draw water from the ground water table through wells, many of which are situated near the coast and are therefore characterized by high salt concentrations.
Storage tank fabricators Oostwouder and Siemerink have expanded Loders Croklaan’s palm-oil tank farm in the Port of Rotterdam, The Netherlands, built in 2004 using duplex LDX 2101®, with 41 new tanks, consuming 1300tns of the same grade.
Sitindustrie has started 2008 by increasing its market position in the business of stainless steel tube, pipes and fittings for the oil & gas application with two orders in Qatar and Malaysia for a total amount of EUR 16.5 million.
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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