Duplex Stainless Steel Material

Abstract: Provided is a duplex stainless steel material having high strength and excellent corrosion resistance. This duplex stainless steel material contains, in mass%, 0.030% or less of C, 0.20-1.00% of Si, 0.5-7.0% of Mn, 0.040% or less of P, 0.0200% or less of S, 0.100% or less of Al, 4.0-9.0% of Ni, 20.0-30.0% of Cr, 0.5-2.0% of Mo, 1.5-3.0% of Cu, 0.15-0.30% of N, 0.01-0.50% of V, 0.05-1.00% of Co, and 0.001-0.050% of Sn, with the remainder comprising Fe and impurities, has a yield strength of at least 758 MPa, and has a microstructure composed of 35-65 vol% of ferrite with the remainder comprising austenite, wherein ?(a) and ?(?), which are the dislocation density in ferrite and the dislocation density in austenite, respectively, satisfy expression (1). (1): 0.3(?)/(a)<4.0

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