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|1. (WO2018043214) DUPLEX STAINLESS STEEL AND METHOD FOR MANUFACTURING SAME|
|Applicants:||JFE STEEL CORPORATION
|Title:||DUPLEX STAINLESS STEEL AND METHOD FOR MANUFACTURING SAME|
Provided is a duplex stainless steel having excellent corrosion resistance, in which excellent carbon dioxide corrosion resistance, excellent sulfide stress corrosion cracking resistance, and excellent sulfide stress cracking resistance are provided at the same time. The present invention has a composition containing, in terms of mass%, 0.03% or less of C, 1.0% or less of Si, 0.10-1.5% Mn, 0.030% or less of P, 0.005% or less of S, 20.0-30.0% Cr, 5.0-10.0% Ni, 2.0-5.0% Mo, 2.0-6.0% Cu, and less than 0.07% of N, the remainder comprising Fe and unavoidable impurities, and the metallographic structure of the present invention has an austenitic phase that is 20-70% by volume ratio and a ferritic phase that is 30-80% by volume ratio.