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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Fine Tubes announced that specialist metal tubing product, Super Duplex, is now available. The tubing is NORSOK M-650 approved and made to order in specialist non-standard sizes for bespoke orders in the oil and gas and chemical process sectors.
Schwanner GmbH has become a full member of the BUTTING Group – and 80 employees have joined the BUTTING family. The companies shared vision is to combine their strengths in the field of pipe production and plant construction with the special expertise in vacuum-insulated pipes.
Sandvik has announced a strategic partnership between Kanthal and HYBRIT, aiming at revolutionizing the steelmaking technology by developing an electric gas heating solution for the hydrogen used to make fossil-free sponge iron.
Subsea 7 S.A. has announced the awarded of a sizeable contract by OKEA to Subsea Integration Alliance for the Hasselmus project, seven kilometres north west of the Draugen platform in the southern Norwegian Sea.
Highland Foundry Ltd, Surrey, BC Canada, is pleased to announce the successful completion of updating the 22Cr (MDS D46) Duplex and 25Cr (MDS D56) Super Duplex casting Qualification Test Records (QTR’s) to the current Rev.5 for NORSOK M-630 Edition 6 and M-650 Edition 4.
Duplex stainless steel forms an integral part in creating one of Sydney’s most exciting new structures. Located in Macquarie Park, the cyclist bridge provides visual flair, safe accessibility, and excitement to the area.
Stamicarbon has signed a contract with Abu Qir Fertilizers Co., in Alexandria, Egypt, for the revamp of one of their urea melt plants (known as Abu Qir 3).
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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