AUSTENITIC STAINLESS STEEL AND MANUFACTURING METHOD THEREFOR

Disclosed are austenitic stainless steel having high elongation and low yield strength for high formability, and a manufacturing method therefor. The austenitic stainless steel, according to the present invention, comprises, by weight %, C: 0.01% to 0.08%, Si: 0.1% to 1.0%, Mn: 0.1% to 1.5%, Cr: 20.0% to 25.0%, Ni: 12.0% to 18.0%, Cu: 0.1% to 1.0%, N: 0.01% to 0.1%, P: 0.035% or less, S: 0.01% or less, and the remainder of Fe and unavoidable impurities, and satisfies the following equation (1) and equation (2). Equation (1): 80+45×C-10×Si+2×Mn-Ni-Cu-70×N > 55 Equation (2): 60+300×C+70×Si-20×Mn+7×Cr+Ni+3×Cu+530×N < 300 (Here, C, Si, Mn, Cr, Ni, Cu, and N represent the content (weight %) of each element.) La présente divulgation concerne un acier inoxydable austénitique ayant un allongement élevé et une faible limite d'élasticité pour une formabilité élevée, et son procédé de fabrication. L'acier inoxydable austénitique selon la présente invention comprend, en % en poids, C : de 0,01 % à 0,08 %, Si : de 0,1 % à 1,0 %, Mn : de 0,1 % à 1,5 %, Cr : de 20,0 % à 25,0 %, Ni : de 12,0 % à 18,0 %, Cu : de 0,1 % à 1,0 %, N : de 0,01 % à 0,1 %, P : 0,035 % ou moins, S : 0,01 % ou moins, et le reste de Fe et d'impuretés inévitables, et satisfait l'équation (1) et l'équation (2) suivantes. Équation (1) : 80+45×C-10×Si+2×Mn-Ni-Cu-70×N > 55 Équation (2) : 60+300×C+70×Si-20×Mn+7×Cr+Ni+3×Cu+530×N < 300 (Ici, C, Si, Mn, Cr, Ni, Cu et N représentent la teneur (% en poids) de chaque élément.) 본 발명은 고성형성 구현을 위해 연신율이 높고 항복강도가 낮은 오스테나이트계 스테인리스강 및 이의 제조방법을 개시한다. 본 발명에 따른 오스테나이트계 스테인리스강은 중량 %로 C: 0.01% 내지 0.08%, Si: 0.1% 내지 1.0%, Mn: 0.1% 내지 1.5%, Cr: 20.0% 내지 25.0%, Ni: 12.0% 내지 18.0%, Cu: 0.1% 내지 1.0%, N: 0.01% 내지 0.1%, P: 0.035% 이하, S: 0.01% 이하, 나머지는 Fe 및 불가피한 불순물을 포함하고, 하기 식(1) 및 식(2)을 만족한다. 식(1): 80+45×C-10×Si+2×Mn-Ni-Cu-70×N > 55 식(2): 60+300×C+70×Si-20×Mn+7×Cr+Ni+3×Cu+530×N < 300 (여기서, C, Si, Mn, Cr, Ni, Cu, N 은 각 원소의 함량(중량%)을 의미함)