POSCO Holdings Inc.
AUSTENITIC STAINLESS STEEL HAVING IMPROVED STRENGTH, AND METHOD FOR MANUFACTURING SAME

Abstract:

Provided is an austenitic stainless steel having improved strength. This austenitic stainless steel includes, in percent (%) by weight, 0.06 to 0.15% of carbon (C), 0.3% or less (excluding 0) of nitrogen (N), more than 1.0% and equal to or less than 2.0% of silicon (Si), 5.0 to 7.0% of manganese (Mn), 15.0 to 16.0% of chromium (Cr), 0.3% or less (excluding 0) of nickel (Ni), 2.5% or less (excluding 0) of copper (Cu), and the remainder of iron (Fe) and inevitable impurities, and satisfies Expressions (1), (2), and (3) below: 15.ltoreq.0.2Mn+337C+1.2Cu-1.7Cr+3.3Ni+78N-3.5Si+3.0.ltoreq.30 Expression (1): 2.3.ltoreq.[Cr+1.5Si]/[Ni+0.31Mn+22C+1Cu+14.2N].ltoreq.3.0 Expression (2): 1.0.ltoreq.((Cr+1.5Si+18)/(Ni+0.52Cu+30(C+N)+0.5Mn+36)+0.262)*161-161.lt- oreq.7.0 Expression (3): wherein C, N, Si, Mn, Cr, Ni, and Cu refer to contents of the elements, respectively.