Austenitic Stainless Steel And Method For Manufacturing Austenitic Stainless Steel

Abstract: Provided is an austenitic stainless steel having excellent strength and ductility. The austenitic stainless steel has: a chemical composition containing 0.005-0.060% of C, 0.20-1.20% of Si, 4.0-8.0% of Mn, 12.0-15.0% of Ni, 19.0-24.0% of Cr, 1.0-4.0% of Mo, 0.05-0.40% of Nb, 0.05-0.40% of V, 0.20-0.50% of N, and 0.050% or less of Al, etc.; a tensile strength of 800 MPa or above; and an elongation at break of 35% or above. The austenitic stainless steel satisfies the following relationships (1) and (2). Relationship 1: 0.7 × Nb = [Nb] = 0.30 Relationship 2: 20 × [Nb]/D = 0.050 In relationships (1) and (2), a value in which the Nb content of the chemical composition is represented in mass%, a value in which the amount of Nb analyzed as an electrolytic extraction residue is represented in mass%, and a value in which the crystal grain diameter is represented in µm, are respectively substituted into "Nb", "[Nb]", and "D".

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