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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Sinosteel Stainless Steel Pipe Technology Co. Ltd. can provide stainless steel welded pipe with annealed condition, stainless steel welded pipes for fluid transport, oil gas large diameter pipe and stainless steel pipe used for shipping.
Sandvik SAF 2507® is a super-duplex (austenitic-ferritic) stainless steel for service in highly corrosive conditions. The grade is characterized by excellent resistance to stress corrosion cracking (SCC) in chloride-bearing environments, excellent resistance to pitting and crevice corrosion, high resistance to general corrosion, very high mechanical strength, physical properties that offer design advantages, high resistance to erosion corrosion and corrosion fatigue and good weldability.
TWI Certification Ltd has launched a new third-party Certification of Manufacture of Special Materials (CMSM) to allow companies to show compliance with the requirements of NORSOK M-650.
Butt weld pipe fitting is designed to be welded on site at its ends to connect pipes and allow change in direction or pipe diameter, branching or ending.
The manufacturing of wires which are tailor-made to its specific purpose, voestalpine Böhler Welding is creating the basis for innovative Wire Arc Additive Manufacturing.
Langley Alloys consider themselves ‘The Home of Super Duplex’. They have been supplying unique alloys for 80 years and created the world’s first super duplex stainless steel nearly 50 years ago.
Team Stainless has published stainless steel design tables. These will make it much easier and faster for engineers to design with structural stainless steel, thus removing a barrier to its specification.
Cast Steel has become an increasingly important part of NovaCast’s business over recent years. The company can cast a very wide variety of both carbon and stainless steels, the bulk of its castings are in the most popular grades.
Langley Alloys is pleased to announce the appointment of Jeroen Bierbooms as their agent for the Benelux region. Langley Alloys Limited is a British company with a worldwide reputation.
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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