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.

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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Major stainless steel rebar application

Carpenter Technology Corp., USA reports the supply of 200 tons of stainless steel reinforcing bar to The Fort Miller Co. of Schyulerville, NY.

Big knife valve

Stainless Valve has introduced its 48" big knife valve.

Super duplex for special regulator

Emerson Process Management has supplied Fisher pressure reducing regulators manufactured from super duplex stainless steel for a gas conditioning skid being developed by Oil and Gas Systems for a UK-based gas transmission company.

Kitz develops stainless steel

Kitz Corporation has developed a duplex phase stainless steel that has achieved lower production costs compares to Single Phase Stainless Steel ASTM A351 CF3M.

Guide to weld purging

A new Guide to Weld Purging has been published by Huntingdon Fusion Techniques.

New pure-screen filters

Axium Process Ltd has launched the first of its range of 316L stainless steel wedge-wire Pure-Screen Filters.

First chemical tanker order from China

AvestaPolarit's Hot Rolled Plate business unit in Degerfors has received an order for hot-rolled plate that will be used to manufacture tanks for a chemical tanker due to be built in China.

Stainless bridge wins award

Sicklauddsbron (Bridge Apaté), a stainless steel bridge that spans the Sickla Canal in the Hammarby Sjöstad area of Stockholm, has received the European Steel Design Award.

Reverse osmosis

CAT Pumps has developed a line of 316 stainless steel and duplex SS pumps exclusively for the saltwater reverse osmosis desalination market.

Weld purging guide

Huntingdon Fusion Techniques has published a free guide to weld purging, aimed for all companies stainless steel, nickel alloy, nickel chrome, duplex or titanium materials.

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.