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 has won a contract to supply seamless coiled tubing made from its SAF 2507®super duplex stainless steel to a geothermal plant in Central America.
New Yorker Electronics has released the new Power Dynamics, Inc. (PDI) watertight Power Stanchion series designed for harsh environments and rugged applications.
HFW Serrated Finned Tubes is short for High Frequency Welded Helical Spiral Serrated Finned Tubes. Helical serrated finned tubes, serrated fins cut from a metal strip and then helically wound around the tubes.The important features of this configuration are Efficiency, effective bond of fins to tubes under all conditions of temperature and pressure, and ability to withstand high fin side temperatures.
To expand storage capacity at Botlek, Gpi has received an order from Maastank for nine stainless steel storage tanks with a total capacity of 16,700m3.
MIMETE Srl announced the newest powders from the iron-base family: standard Duplex MARS F51 and Super-duplex MARS F53. Duplex steel F51 is a widely used grade, where the relatively high content of Cr, Mo, and Ni generates better performing mechanical properties when compared to austenitic stainless steel.
H2O Innovation Inc. (H2O Innovation) announced that its business line Piedmont secured three large orders for fiber reinforced polyester (FRP) cartridge filter housings and duplex stainless couplings, totaling USD 3.3M.
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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