DUPLEX STAINLESS STEEL

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A duplex stainless steel excellent in the weldability during large heat input welding and in the stress corrosion cracking resistance in a chloride environment containing corrosive associated gases has a chemical composition consisting, by mass %, of C : 0.03% or less, Si : 0.2 to 1%, Mn : 5.0% or less, P : 0.040% or less, S : 0.010% or less, sol. Al : 0.040% or less, Ni : 4 to 8%, Cr : 20 to 28%, Mo : 0.5 to 2.0%, Cu : more than 2.0% and 4.0% or less and N : 0.1 to 0.35%, and optionally contains one or more selected from among V, Ca, Mg, B and a rare earth metal(s), with the balance being Fe and impurities; wherein the duplex stainless steel satisfies the following formulas : [in-line-formulae]2.2Cr+7Mo+3Cu>66   (1)[/in-line-formulae] [in-line-formulae]Cr+11Mo+10Ni<12(Cu+30N)   (2), [/in-line-formulae] wherein the symbols represent mass % of the elements in the steel.