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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.

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.

New titanium from Allegheny

Stainless Steel World Publisher - August 19, 2003

Allegheny Technologies Incorporated announces ATIT 425 titanium, a new titanium product that is an alternative to the most common high-strength titanium alloy and an addition to ATI's range of high-strength titanium alloys.

Sandvik boosts flat-rolled capacity

Stainless Steel World Publisher - August 18, 2003

Sandvik Materials Technology has invested in and has now commissioned a new rolling mill for the production of stainless steel flat wire - a Sandvik speciality produced as an alternative to narrow strip.

Orbital cutting machine

Stainless Steel World Publisher - August 8, 2003

Axxair has launched its latest model of orbital cutting machine.

Parker expands tube range

Stainless Steel World Publisher - August 4, 2003

At Offshore Europe, Parker Instrumentation will expand its family of rapid-assembly, compression tube fittings for pressures up to 15,000PSI.

Sandvik promotes tubular products

Stainless Steel World Publisher - July 21, 2003

Sandvik Materials Technology is using Offshore Europe 2003 (Aberdeen, UK, 2–5 September 2003) to promote its full range of stainless steel tubular products for topside, subsea and downhole use.

Quick-fit fittings expand to half-inch sizes

Stainless Steel World Publisher - July 11, 2003

At Offshore Europe in September, Parker Instrumentation will expand its family of rapid-assembly, compression tube fittings for pressures up to 15,000lb/in2.

Sandvik upgrades duplex bar

Stainless Steel World Publisher - July 9, 2003

Sandvik Materials Technology has enhanced the machinability of its Sandvik Sanmac grade SAF 2205, duplex stainless steel round bar.

Parker extends manifold range

Stainless Steel World Publisher - July 8, 2003

Parker Instrumentation has extended the versatility of its high-integrity manifold range, with new exotic alloy versions to assure corrosion-free performance in a wider range of fluid instrumentation applications.

Parker expands tube fitting range

Stainless Steel World Publisher - June 30, 2003

At Offshore Europe, Parker Instrumentation will expand its breakthrough family of rapid-assembly, compression tube fittings for pressures up to 15,000 PSI.

Super stainless steel chain

Stainless Steel World Publisher - June 27, 2003

A joint venture of Sugiyama (Japan) and Cross + Morse (UK) has developed a new chain series made of super stainless steel.

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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. There are several variants available, such as Duplex 2205, Superduplex 2507 or lean duplex with lower nickel content.

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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