Patent ID: 8778260
Filing Date: 2014-07-15
Classification: C21C,C21D,C22C

Abstract:
1. Duplex stainless steel characterized by containing, by mass %, C: 0.06% or less, Si: 0.05 to 3.0%, Mn: 0.1 to 6.0%, P: 0.05% or less, S: 0.010% or less, Ni: 1.0 to 10.0%, Cr: 18 to 30%, Mo: 3.0% or less, Cu: 3.0% or less, N: 0.10 to 0.40%, Al: 0.001 to 0.08%, Ti: 0.003 to 0.042%, Mg: 0.0001 to 0.0030%, and O: 0.010% or less, having a product of f N , Ti content, and N content as f N ×Ti×N of 0.00004% 2 or more, having a product of Ti content and N content as Ti×N of 0.008% 2 or less, having a balance of Fe and unavoidable impurities; where f and having an equiaxial crystal structure and a ferrite phase ratio in the range of 30 to 70%.