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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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Super duplex used in fluid system solution

Sandvik Steel AB (Sweden) and Swagelok (USA) have together produced an integrated fluid system solution using Sandvik’s super duplex stainless steel grade SAF 2507™, that performs successfully in highly corrosive, chloride-containing environments, such as oil and gas exploration and production.

Bright future for stainless in architecture

Fabricators of stainless steel can expect future high demand for their products in architectural applications, according to a recent report by Paul Snelgrove written for the British Stainless Stainless Steel Association.

Golden choice

Two 2205 duplex stainless steel elution columns over 12 metres long have been installed in a replacement project at Kalgoorlie Consolidated Gold Mines in Western Australia.

Raccortubi: changes at the top

Raccortubi Group announces that Mr Ottavio Carollo has been appointed General Manager of Raccortubi.

Uprated dosing pump

The MRoy range of dosing pumps has been extended with the introduction of the XB model, a hydraulically actuated diaphragm pump which delivers flow rates up to 310 litre/h and maximum pressures of 105bar.

Gibson appoints new director

Gibson Tube Inc. (North Branch, New Jersey, USA), a specialist in welded stainless steel, nickel and duplex alloy tubing, has recently opened a new office in Houston, Texas.

New bridge using stainless steel rebar

The Oregon Department of Transportation (ODOT), using highly alloyed stainless steel reinforcing bar in its concrete structures

Karl Schäfer retires from Butting

An appreciation by Sjef Roymans of Stainless Steel World

Pro Metals relocates to larger facility

Pro Metals Inc., the distributor of alloy piping products, has announced its relocation to a new, larger facility in Houston, Texas, the company’s base of operations.

Marine Corrosion Club

The Marine Corrosion Club is organising its annual series of technical presentations in the UK.

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.