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Duplex Stainless Steels

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.

Discover the latest innovations in duplex technology with our exclusive Duplex World Update. Download this comprehensive 3-part series now and gain valuable insights from industry experts on groundbreaking applications and developments in duplex material science.

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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Low cost duplex hollow sections

Stalatube Oy has the capability to manufacture square and rectangular hollow sections in a new grade called ’Lean duplex’.

Hot-water cylinders

New from Johnson and Starley (UK) is the Aquastar Premier range of stainless steel, duplex hot water cylinders, with both direct and indirect models.

Multi-basket process filters

New filter housings from Rosedale Products Europe (UK) are now available in seven sizes holding from 2 to17 industry standard filter bags or strainer baskets, providing compact filtration units for flows up to 13250 l/min.

Hi-Check non-return valves

Parker Instrumentation (UK) has launched a new series of non-return valves.

New pure-screen filter range

Axium Process’s (UK) Pure-Screen wedge wire stainless steel filter range now includes duplex, multiplex and jacketed filter options.

New bridge in Brooklyn

Granite Halmar Construction Co. Inc. has constructed a bridge, in Brooklyn, New York, in 261 days.

Rolling mill produces 27-ton rings

BRÜCK® develops and manufactures seamless rolled rings from stainless steel such as Duplex and Superduplex for use in space travel at its production location in Ensheim.

U bolts and industrial fasteners

Bendfast UK Ltd specialise in the manufacture of industrial fasteners and fixings associated with the installation and support of pipe-work or tubular constructions in diameters from 1/2� up to 24� in size.

Pipes for Australian gas field

BUTTING has won an order to supply BuBi®-pipes to a gas field off the coast of Western Australia.

Stainless corrosion handbook

Outokumpu Stainless has published the 9th edition of the Corrosion Handbook.

The advantages of Duplex Stainless Steels

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.