DUPLEX STAINLESS STEELS AND USES THEREOF

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It is provided a duplex stainless steel for use in a urea production plant and/or in a urea production process, containing in weight percentage (%w) : C 0, 03 or less; Si 0, 5 or less; Mn 2, 5 or less; Cr from more than 30, 0 to 35, 0; Ni from 5, 5 to 8, 0; Co from 0, 01 to 0, 8; Mo from 2, 0 to 2, 5; W 2, 5 or less; N from 0, 3 to 0, 6; Cu 1, 0 or less; and having one or more of : 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 balance being Fe and impurities; and satisfying the relationship : Z = 1, 062 (Ni+Co) + 4, 185 Mo is between 14, 95 and 19, 80.