Duplex Stainless Steel Material

Abstract: Provided is a duplex stainless steel material having excellent whole surface corrosion resistance in a high-temperature, high-pressure, strong acidic corrosive environment, and excellent pitting corrosion resistance in a high-temperature, high-pressure, chloride corrosive environment. The duplex stainless steel material according to the present disclosure has a chemical composition containing, in mass%, 0.050% or less of C, 0.2-1.2% of Si, 0.5-7.0% of Mn, 0.040% or less of P, 0.010% or less of S, 20.0-27.0% of Cr, 4.0-9.0% of Ni, 0.5-5.0% of Mo, 0.0005-0.0100% of As, a total of 0.0005-0.0100% of one or more of Ca and Mg, 0.001-0.050% of sol.Al, 0.40% or less of N, and 0.100% or less of O, with the remainder comprising Fe and impurities, and satisfies relationships (1) and (2). (1) 0.70 < 10000 × As/(Ni + Cu) < 16.00; (2) (Ca + Mg)/O < 1.50

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