POSCO Holdings Inc.
NONMAGNETIC AUSTENITIC STAINLESS STEEL AND MANUFACTURING METHOD THEREFOR

Abstract:

A non-magnetic austenitic stainless steel includes, in percent (%) by weight of the entire composition, C: 0.01 to 0.05%, Si: 1.5% or less, Mn: 0.5 to 3.5%, Cr: 17.0 to 22.0%, Ni: 9.0 to 14.0%, Mo: 1.0% or less, Cu: 0.2 to 2.5%, N: 0.05 to 0.25%, the remainder of iron (Fe) and other inevitable impurities, and satisfies following Formulas (1) and (2). (1) 0.ltoreq.3*(Cr+Mo)+5*Si-65*(C+N)-2*(Ni+Mn)-27.ltoreq.5 and (2) 660-500*(C+N)-10*Cr-30*(Ni+Si+Mo+Cu).ltoreq.0.