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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Sandvik Duplex now readily availableSandvik Sanmac™ SAF 2205 hollow bar is now readily available on short delivery time from Sandvik Materials Technology. The stock range includes duplex hollow bar from 32mm to 250mm outside diameter and in random length from 2.5m to 6m, as standard. Sandvik duplex stainless steel hollow bar offers a significant benefit to component manufacturers with possible cost reductions of more than 40%.
The new Myllysilta bridge to be constructed in Turku will have a modern stainless steel cladding. The cladding will be made out of Outokumpu duplex stainless steel. The new bridge is scheduled for completion next autumn as the original Myllysilta bridge began to sag downwards in March 2010 and had to be demolished. WSP received the design competition award arranged by the city of Turku with their Myllyn Teräs bridge proposal.
TITAN Metal Fabricators has opened a wholly-owned production subsidiary in India. TITAN Metal Fabricators India is TITAN’s first expansion outside of the United States. This new operation includes manufacturing facilities in Mathura, 90mi south of New Delhi
A.D.Tubi Inossidabili SpA will expand into North America, Mexico, and the South and Central American markets in partnership with Kipp International Steel Sales.
The Vasa Museum and Sandvik are taking on a critical project to replace 5000 wrought iron bolts on the Swedish heritage vessel. A national treasure, Vasa capsized and sank in 1628 as it prepared for its maiden voyage; it was raised from the bottom of the harbour in 1961 and carefully restored.
TISCO achieved a significant increase in duplex steel production for 2010, producing a total development amount of 1000tns. This is an increase by 66% compared to 2009, fully replacing imported products.
Tectubi Raccordi, a subsidiary of Allied Group, has acquired a majority share in Gieminox S.R.L., a consolidated manufacturer of longitudinal welded pipes, fittings and auxiliary components in stainless steel, nickel and nickel alloys, duplex and superduplex.
Polysoude has created new, more productive and ergonomic high tech weld heads, setting a new technological standard for automated orbital TIG welding. The new orbital welding heads make tube to tubesheet welding and tube-tube welding especially easy for the operator.
TIP TIG’s weld process, developed in Austria, offers several weld quality, productivity, and cost benefits. The process offers less weld rework when compared to traditional TIG – SAW – FCAW and Pulsed MIG used on code quality welds, providing consistent manual and automated weld quality.
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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