Duplex Stainless Steel Material

Abstract: The present invention provides a duplex stainless steel material which has excellent intergranular corrosion resistance. A duplex stainless steel material according to the present disclosure is composed of, in mass%, 0.030% or less of C, 0.50% or less of Si, 2.00% or less of Mn, 0.040% or less of P, 0.0010% or less of S, 26.0% to 28.0% of Cr, 6.0% to 10.0% of Ni, 0.20% to 1.70% of Mo, more than 2.00% but not more than 3.00% of W, more than 0.30% but not more than 0.40% of N, 0.020% or less of O and 0.050% or less of Al, with the balance being made up or Fe and impurities; and if the longitudinal direction and the thickness direction of three rectangular regions thereof are respectively defined as direction L and direction T, and five line segments that divide each region into six equal parts in direction L are defined as line segments LS, the average thickness TF of ferrites overlapping with 15 line segments LS is 2.50 µm to 4.50 µm, the sample standard deviation ?TF of the ferrite thickness is 0.50 µm or less, and the average thickness TA of austenites overlapping with the line segments LS is 2.50 µm to 4.50 µm.

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