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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When comparing prices for different stainless steel grades, current market conditions still hugely favor the use of Lean Duplexes. Potential weight savings is an extra bonus.
Aker Solutions has been awarded a front-end engineering and design (FEED) contract from Aker BP for the NOA Fulla field development on the Norwegian Continental Shelf.
Van Oord has been awarded a contract for the specialised seabed interventions services of Subsea Rock Installation (SRI) related to the Ormen Lange Field operated by A/S Norske Shell.
From now on, interested business customers and existing customers of MODERSOHN® can purchase standard parts and fastening accessories, especially made of Lean Duplex 1.4362 and Duplex 1.4462, in the new online store.
Expanite replaces or supplements the widespread DLC coatings with its technology. Diamond-like carbon or DLC coatings are currently used in many areas where excellent friction properties and good wear resistance are required on component surfaces.
Sandvik and BEAMIT Group (of which Sandvik owns a 30% stake) have introduced the Osprey 2507 super-duplex stainless-steel to the additive manufacturing market, having leaned on its extensive experience in developing similar materials for traditional manufacturing technologies.
A recent study has shown that super-duplex stainless steel powder feedstocks specified for use in directed energy deposition additive manufacturing processes can have an oxygen composition nearly five times higher than that present in comparable wrought forms.
During the long-term service of nuclear power plants, the duplex stainless steel (DSS) plate in the spent fuel pool ages. Its failure mechanism is mainly uniform corrosion, stress corrosion cracking (SCC) and pitting corrosion, which poses a serious threat to the safe operation of nuclear power plants. Repairs are usually done by underwater welding technology to reduce the equipment maintenance costs and exposure to radiation.
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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