HIGH CORROSION RESISTANT AUSTENITIC STAINLESS STEEL

Disclosed is highly corrosion resistant austenitic stainless steel. According to an embodiment of the present invention, the high corrosion resistance austenitic stainless steel comprises: 0.025-0.05 wt% of carbon (C); 0.2-1.5 wt% of silicon (Si); 0.5-3.0 wt% of manganese (Mn); 20.0-26.0 wt% of chromium (Cr); 23.0-26.0 wt% of nickel (Ni); 3.0-5.0 wt% of molybdenum (Mo); 0.25-0.35 wt% of nitrogen (N); and the remainder including iron (Fe) and inevitable impurities, wherein the high corrosion resistance austenitic stainless steel satisfies the following formula (1): Cr + 3.3 × (Mo + 0.5 × W) + 16 × N > 40, and formula (2): 465.8 - 293.9 × C - 3.5 × Si + 5.3 × Mn + 22.4 × Cr - 7.4 × Ni + 58.0 × Mo - 0.2 × Cu + 62.8 × W - 250.3 × N < 1,020. The present invention has an effect of providing austenitic stainless steel capable of suppressing formation of a sigma phase while achieving excellent corrosion resistance. 고내식 오스테나이트계 스테인리스강이 개시된다. 본 발명의 일 실시예에 따른 고내식 오스테나이트계 스테인리스강은 중량%로, C: 0.025% 내지 0.05%, Si: 0.2% 내지 1.5%, Mn: 0.5% 내지 3.0%, Cr: 20.0% 내지 26.0%, Ni: 23.0% 내지 26.0%, Mo: 3.0% 내지 5.0%, N: 0.25% 내지 0.35%, 나머지 Fe 및 불가피한 불순물을 포함하고, 하기 식 (1) 및 (2)를 만족한다. (1) Cr ＋ 3.3×(Mo + 0.5×W) ＋ 16×N > 40 (2) 465.8 － 293.9×C － 3.5×Si ＋ 5.3×Mn ＋ 22.4×Cr － 7.4×Ni ＋ 58.0×Mo － 0.2×Cu ＋ 62.8×W － 250.3×N < 1020