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. They 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.

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.

Manifolds in exotic materials

Parker Instrumentation has launched Pro-Bloc, a range of one-piece double-block-and-bleed manifolds designed to reduce the size and weight of process monitoring instrumentation installations.

New titanium from Allegheny

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

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

Axxair has launched its latest model of orbital cutting machine.

Parker expands tube range

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

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.