High-nitrogen austenitic stainless steels with good Eco-index and excellent pitting corrosion resistance, and fabrication methods thereof

摘要

The present invention relates to a high-nitrogen austenitic stainless steel having a combination of strength and ductility and excellent pitting resistance, and to a method for manufacturing the same. Specifically, 17.0 to 19.0 wt% chromium (Cr) and 11.0 to 21.0 wt% manganese ( Mn), up to 5.0 weight percent nickel (Ni), 2.5 to 3.5 weight percent molybdenum (Mo), 0.5 to 1.2 weight percent nitrogen (N), balance iron (Fe) and other unavoidable impurities It provides 0.03% by weight or less of carbon (C), 0.25% by weight or less of silicon (Si), and provides the austenitic stainless steel and a method for producing the same, characterized by satisfying the following formula (1). " (1) " 5.0 ≤ Ni + 25 × N + 0.5 × Mn-Cr-1.5 × Mo ≤ 14.0 The austenitic stainless steel of the present invention has lowered the nickel (Ni) content, which leads to an increase in price and price instability of stainless steel by adding manganese (Mn) and nitrogen (N), thereby improving economics and price stability of production materials. It can be effective. In addition, the austenitic stainless steel of the present invention can obtain a stable austenitic single phase due to the high nitrogen (N) content, and simultaneously exhibits high strength, elongation, and improvement of pitting resistance, particularly pitting resistance of commercially available AISI 316L stainless steel or more. It is effective to have.