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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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Deepwater duplex

Sandvik Materials Technology states that its newly developed duplex stainless steel tube grades are providing the ultra-high strength and corrosion resistance needed for the wellhead control systems for today’s enhanced oil and gas recovery methods.

UK: Smar to supply Ekofisk

Smar will supply more than 400 pressure and temperature transmitters to a platform in the North Sea operated by ConocoPhillips.

Outokumpu bridge project

Outokumpu Stainless Hot Rolled Plate has received an order from Hong Kong for stainless steel to be used in the construction of a bridge.

BUTTING supplies Oman gas project

BUTTING has supplied about 1840 tons of duplex pipes for the Saih Nihayda Gas project in Oman.

Submersible pump from Lowara

Lowara, part of the ITT Industries Group, has introduced a new submersible pump made of stainless steel.

New technology treats process wastewater

Nature Environmental Solutions Ltd (NESL) has delivered a 100,000 litre continuous biological treatment unit to a large Danish manufacturer.

Solving spring cracking

Sandvik Materials Technology's duplex stainless steel grade, Sandvik SAF 2205, is being used for wire springs in electrical contact systems on railway locomotives.

Stainless tankers

A UK tanker manufacturer has adopted stainless steel and updated welding techniques for the manufacture of road tankers.

Bridge order for Outokumpu in Spain

The world's first overpass bridge to be made entirely from stainless steel is to be built in Spain, using material from Outokumpu Stainless

Valves for flue gas

Stainless Valve Company (North Carolina, USA) has supplied two of its 48" Big Knife valves for flue gas application, made in duplex stainless steel 2205.

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.