Austenitic Stainless Steel And Manufacturing Method Thereof

Abstract: Disclosed in the specification are ultrafine austenitic stainless steel that simultaneously meets a high strength, a high elongation, and a high yield ratio, and a manufacturing method thereof. The austenitic stainless steel according to an embodiment of the present disclosure comprises, by weight%, 0.005 to 0.03% of carbon (C), 0.1 to 1.0% of silicon (Si), 0.1 to 2.0% of manganese (Mn), 6.0 to 12.0% of nickel (Ni), 16.0 to 20.0% of chromium (Cr), 0.01 to 0.2% of nitrogen (N), 0.25% or less of niobium (Nb), and the balance of iron (Fe) and inevitable impurities and has a mean grain size (d) of 5 ? or less at the thickness center part, with the fraction of a recrystallized area in a band pattern being 10% or less.

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