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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Stoody offers all position flux cored stainless steel and nickel-based wires for joining and cladding. The inventor and provider of “hardfacing” alloys for 90 years, Stoody® produces a full range of stainless and high-alloy joining wires at its Bowling Green, Kentucky facility.
The Van Leeuwen Pipe and Tube Group has acquired Teuling Staal B.V. A specialist in the field of duplex and super duplex stainless steel materials, Teuling Staal is a leading supplier of duplex and super duplex stainless steel pipes, fittings, flanges and special products for the Oil and Gas
Macalloy has re-launched its stainless cable product range. The new stainless cable range includes Macalloy’s original Guy Linking Architectural Cable System, alongside Macalloy’s new SC460 Architectural Cable System.
Italy-based Marcegaglia Group has invested in a new stainless pipe and flat steel service center in Vladimir. The new establishment will produce about 35,000tns of steel per year, with an expected turnover of EUR 130 million,
Outokumpu has delivered duplex stainless steel rebar to the construction of the traffic route Norra Länken in Stockholm, Sweden. Norra Länken is a large infrastructure investment in a new traffic route around
Outokumpu will deliver special stainless steel for the project to rebuild the dam in Tammerkoski rapids. All of the main structural parts of the sluice and flood gates will be made using Outokumpu's lean duplex LDX 2101®
T.D. Williamson SA (TDW) has completed a subsea hot tap intervention operation to facilitate the successful tie-in of a new gas pipeline to an existing pipeline. The new pipeline forms a portion of the Burullus Gas Company’s West Delta Deep Marine (WDDM) Phase VII development project
Outokumpu will deliver stainless steel to Börger GmbH. The duplex will be used to build tanks required in biogas production. This order marks Outokumpu's first order for the newly launched duplex steel grade LDX 2404®. The steel will be produced at the Outokumpu in Avesta, Sweden. LDX 2404® is the ideal choice for the tanks due to the high corrosion resistance and superior mechanical properties of the steel.
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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