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 stress corrosion cracking 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. The duplex (UNS S32304/ DIN 1.4362), also known as "lean duplex", is an attractive option for application in storage tanks, flexible tubes, road equipment, tanks for ships and equipment for the chemical segment, and pulp and paper segment.