AUSTENITIC STAINLESS STEEL WITH EXCELLENT CORROSION RESISTANCE OF WELDED PART

Disclosed is austenitic stainless steel which has excellent hot workability, and exhibits enhanced corrosion resistance of welded parts of hot-rolled and cold-rolled material. Austenitic stainless steel with excellent corrosion resistance of welded parts, according to an embodiment of the present invention, comprises, by wt%, 0.02-0.07% of C, 0.2-0.7% of Si, 2.5-4.0% of Mn, 2.5-4.0% of Ni, 17.0-19.0% of Cr, less than 0.1% of P, less than 0.01% of S, 1.0-3.0% of Cu, 0.1-0.2% of N, and the remainder of Fe and inevitable impurities, and has a crack resistance index (CRN), represented by formula (1) below, of greater than or equal to 0. (1) CRN=542+ 715C-27Si-1.49Mn+38.8Ni-52.5Cr+35.8Cu+ 939N. 公开了具有优异的热加工性，并且表现出提高的热轧和冷轧材料的焊接部耐腐蚀性的奥氏体不锈钢。根据本发明的一个实施方案的具有优异的焊接部耐腐蚀性的奥氏体不锈钢包含以重量％计0.02％至0.07％的C、0.2％至0.7％的Si、2.5％至4.0％的Mn、2.5％至4.0％的Ni、17.0％至19.0％的Cr、小于0.1％的P、小于0.01％的S、1.0％至3.0％的Cu、0.1％至0.2％的N、以及剩余部分的Fe和不可避免的杂质，并且具有大于或等于0的由下式(1)表示的抗裂指数(CRN)。(1)CRN＝542+715C-27Si-1.49Mn+38.8Ni-52.5Cr+35.8Cu+939N。