The duplex stainless steel combines high mechanical resistance and corrosion resistance. Result of a perfect union between austenitic stainless steels and ferritic stainless steels, this grade combines the best characteristics of both alloys, such as imunity to corrosion under tension and good weldability. The addition of nitrogen to duplex stainless steels increases tenacity and corrosion resistance of the HAZ (Heat-Affected Zone) compared to the base metal in welded condition.

With low percentage of nickel in its chemical composition, these steels present yield strength much higher than the austenitic stainless steels, which enables the design of projects with smaller thickness and greater corrosion resistance. Aperam South America currently produces duplex stainless steel (UNS S32205/ UNS S31803/ DIN 1.4462), with excellent resistance to corrosion and mechanical resistance.

Used in the oil & gas industry on flexible pipes for the extraction of oil, it can also be applied on chemical storage tanks as well as on equipment for pulp and paper segment.