| 摘要 |
PURPOSE: A method for manufacturing ferritic stainless steel is provided to improve corrosion resistance and toughness by adding Nb and Al in Cr-rich stainless steel and carrying out proper heat treatment. CONSTITUTION: The manufacturing method of the ferritic stainless steel comprises the process of (i) hot rolling a stainless steel comprising C 0.02wt.% or less, Si 0.5wt.% or less, Mn 0.5wt.% or less, P 0.03wt.% or less, S 0.0025wt.% or less, Cr 26-35wt.%, Mo 4wt.% or less, N 0.0295wt.% or less, Nb 0.6wt.% or less, Al 0.2wt.% or less, a balance of Fe, and other inevitable impurities in the temperature range of 1180 to 1250deg.C wherein (C+N)≤0.03%, (Cr+Mo)≧30%, (Nb+Al)/(C+N) is between 10-25; (ii) quenching after finish hot rolling in the temperature range of 800 to 900deg.C; (iii) quenching after annealing hot rolled steel sheet in the temperature range of 1000 to 1100deg.C; (iv) cold rolling; (v) quenching after annealing cold rolled steel sheet in the temperature range of 1000 to 1100deg.C.
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