Manufacturing method of ferritic stainless steel with high corrosion resistance and high formability

摘要

The present invention relates to a method for manufacturing ferritic stainless steel having high formability and high corrosion resistance, while controlling the amount of Cr, Mo and Cu added in the steel using a formula potential value, while (Nb + T1) / (C + N The purpose of the present invention is to provide a ferritic stainless steel manufacturing method having excellent corrosion resistance and moldability by optimizing the ratio of Nb and Sib). The present invention for achieving the above object in the manufacturing method of ferritic stainless steel, by weight ratio, C: 0.02% or less, Si: 0.6% or less, Mn: 0.5% or less, P: 0.03% or less, S: 0.003% or less , Cr: 17.5-23%, Mo: 4% or less, N: 0.02% or less, Cu: 0.3-0.7%, Ti: 0.3% or less, Nb: 0.6% or less, remaining Fe and other unavoidable impurities Adjust the content of Cr, Mo and Cu so that the sum of C and N is 0.03% or less, and the official potential (E ' ₁₀₀ ) is 300 or more. (Nb + Tl) / (C + N): 10- 20 and Nb / Ti: Stainless steel satisfying 2 or more is heated to 1150-1250 ℃ temperature range and hot rolled to 750-900 ℃ temperature range, hot-rolled at 900-1000 ℃ temperature range and then quenched. After cold rolling, cold rolling annealing under the same conditions as the hot rolling annealing, and then quenching the ferritic stainless steel manufacturing method having high formability and high corrosion resistance Let that point be about that.