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The present invention is directed to a duplex stainless steel alloy which contains the following elements, in % by weight with respect to the total weight of the composition : C : 0.001% to 0.03%; Si : 0.001% to 0.5%; Mn : 0.001% to 2.5%; Cr : more than 30.0% up to 35.0%; Ni : 5.5% to 8.0%; Mo : 2.0%to 2.5%; W : 2.5% or less; Co : 0.01% to 0.8%; N : 0.3% to 0.6%; Cu : 0.001% to1.0%; having one or more of the following : Ca : 0.0040% or less; Mg : 0.0040% or less; one or more rare earth elements in a total amount of 0.1% or less; the remainder being Fe and unavoidable impurities; and wherein the relationship CRC =.062*(Ni + Co) + 4.185*Mo is between 14.95 and 19.80. The duplex stainless steel alloy displays a high resistance to corrosion and is especially suitable for use in the production 10 of urea.