AUSTENITIC STAINLESS STEEL WITH EXCELLENT CORROSION CHARACTERISITCS OF WELDING ZONE AND SURFACE CHARACTERISITICS

The present invention provides an austenitic stainless steel with excellent corrosion resistance and surface characteristics of a welding part. An austenitic stainless steel with excellent corrosion resistance and surface characteristics of a welding part, according to one embodiment of the present invention, contains, by wt%, 0.04 to 0.07 % of C, 0.2 to 0.5 % of Si, 3.5 to 5.0 % of Mn, 5.0 to 6.0 % of Ni, 19.0 to 22.0 % of Cr, 0.1 % or less of P, 0.01 % or less of S, 1.5 to 2.5 % of Cu, 1.0 % or less of Mo, 0.25 to 0.35 % of N, and balance consisting of Fe and unavoidable impurities. An intergranular corrosion index (IGCN) value represented by the following formula (1) is 0 or more. The following formula (1) is represented by IGCN = 15.4 - 296C - 3.77Si + 0.0019Mn + 0.363Cr - 0.292Ni - 0.861Cu - 2.99Mo + 11.4N. In the formula (1), C, Si, Mn, Cr, Ni, Cu, Mo, and N mean the wt% of each element. The present invention can secure corrosion resistance while reducing costs. 본 발명은 용접부 내식성 및 표면특성이 우수한 오스테나이트계 스테인리스강을 개시한다. 본 발명의 일 실시예에 따른 용접부 내식성 및 표면특성이 우수한 오스테나이트계 스테인리스강은 중량%로, C: 0.04 내지 0.07%, Si: 0.2 내지 0.5%, Mn: 3.5 내지 5.0%, Ni: 5.0 내지 6.0%, Cr: 19.0 내지 22.0%, P: 0.1% 미만, S: 0.01% 미만, Cu: 1.5 내지 2.5%, Mo: 1.0% 미만 N: 0.25 내지 0.35%, 나머지 Fe 및 불가피한 불순물을 포함하고, 하기 식 (1)로 표시되는 입계부식지수(IGCN) 값이 0 이상이다. (1) IGCN = 15.4 - 296C - 3.77Si + 0.0019Mn + 0.363Cr - 0.292Ni - 0.861Cu - 2.99Mo + 11.4N 식 (1)에서, C, Si, Mn, Cr, Ni, Cu, Mo, N는 각 원소의 중량%를 의미한다.