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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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.
Avesta Welding has expanded its line of duplex products with the LDX 2101-4D, a covered electrode specifically designed for welding LDX 2101® thin walled pipes.
SNK America Inc.'s latest addition to its range of hard metal 5-axis machines, the FSP-80V Vertical Spindle 5-Axis Profiler productively and precisely machines hard metals, including titanium, inconel, stainless steel and more.
Germany-based plantmaker SMS Siemag has received an order from Taiwan's Fuxin Special Steel Co. Ltd., for the supply of a steelworks for the production of stainless steel slabs. The new steelworks will utilize the waste heat from the AOD converter and
Parker Steel has expanded its inventory to include Titanium round bar available in ASTM B348 ranges from 8mm to 30mm, as well as ASTM B265 Sheet in 1, 4, and 5mm thicknesses. All Titanium complies with DFAR qualified countries and is backed
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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