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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Stala Tube has manufactured high-quality (duplex) stainless steel hollow sections and I-beams for many years. The company develops its product portfolio based on customer feedback, with non-standard sizes and speciality stainless steel materials happily catered for.
Weld Purging large diameter pipework made from stainless, duplex and chrome steels, titanium or zirconium can be expensive, with requirements to have the oxygen level well below 100 ppm during the welding cycle.
There are hundreds of thousands of bridges in the world. They provide essential links between regions and countries. The costs of maintenance or/and replacement amount to huge figures over time.
An exciting project has been initiated by Sandvik and strategic business partner Stamicarbon. The project concept is to recycle high alloy steel by offering fertilizer customers a special buy-back solution when replacing equipment at their plants.
Sandvik has won the first large scale stainless steel umbilical tube order in Brazil’s pre-salt Mero oilfield. The milestone contract is significant for the offshore Brazilian oil and gas industry, which typically uses thermoplastic hose umbilicals.
To increase the availability of its high-quality seamless stainless tube, add flexibility for introducing new grades and strengthen regional service, Sandvik is adding a new cold finishing tube manufacturing line at its Mehsana Mill, in Gujarat western India.
Prysmian Group has been awarded a contract by Libra, a consortium of prime international oil & gas operators, for Steel Tube Umbilicals to be installed in the Mero offshore oilfield.
As the city of Toronto keeps expanding, accessibility and connectivity are becoming key topics. To ensure a connection between downtown Toronto and the neighborhood of Fort York, the Garrison Crossing was built with UR 2205 Duplex stainless steel from ArcelorMittal Industeel.
Swedish manufacturer of premium stainless steel fasteners, BUMAX has received a large order for corrosion resistant and maintenance free studs to be used for a wind farm off the Belgian coast.
With the CNC 220 HD, Schwarze-Robitec has now delivered a suitable solution to the Norwegian company Framo. The manufacturer of pump solutions for cargo offloading systems and oil and gas extraction processes now uses the reliable and highly robust tube and pipe bending machine for the fast and efficient production of custom-fit tube and pipe systems.
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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