Ferritic stainless steel sheet

Abstract

Provided is a ferritic stainless steel sheet excellent in terms of corrosion resistance with which a decrease in the quantity of surface defects and an improvement in toughness are realized at the same time. The ferritic stainless steel sheet has a chemical composition containing, by mass %, C: 0.020% or less, Si: 0.05% to 0.40%, Mn: 0.05% to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001% to 0.15%, Cr: 20.0% to 23.0%, Ni: 0.01% to 0.80%, Cu: 0.30% to 0.80%, Ti: 0.10% to 0.50%, Nb: 0.010% to 0.150%, Zr: 0.005% to 0.150%, N: 0.020% or less, and the balance being Fe and inevitable impurities, in which relational expression (1) below is satisfied. Zr≤Nb≤Ti  (1) (Here, each of Zr, Nb, and Ti in relational expression (1) denotes the content (mass %) of the corresponding chemical element.)

1 . A ferritic stainless steel sheet having a chemical composition containing, by mass %, C: 0.020% or less, Si: 0.05% to 0.40%, Mn: 0.05% to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001% to 0.15%, Cr: 20.0% to 23.0%, Ni: 0.01% to 0.80%, Cu: 0.30% to 0.80%, Ti: 0.10% to 0.50%, Nb: 0.010% to 0.150%, Zr: 0.005% to 0.150%, N: 0.020% or less, and the balance being Fe and inevitable impurities, in which relational expression (1) below is satisfied:
   Zr≤Nb≤Ti  (1),
   where each of Zr, Nb, and Ti in relational expression (1) denotes the content (mass %) of the corresponding chemical element.   
     
     
         2 . The ferritic stainless steel sheet according to  claim 1 , the steel sheet having the chemical composition further containing, by mass %, one, two, or more selected from Co: 0.01% to 0.50%, Mo: 0.01% to 0.30%, and W: 0.01% to 0.50%. 
     
     
         3 . The ferritic stainless steel sheet according to  claim 1 , the steel sheet having the chemical composition further containing, by mass %, one, two, or more selected from V: 0.01% to 0.50%, B: 0.0003% to 0.0030%, Mg: 0.0005% to 0.0100%, Ca: 0.0003% to 0.0030%, Y: 0.001% to 0.20%, and REM (rare-earth metal): 0.001% to 0.10%. 
     
     
         4 . The ferritic stainless steel sheet according to  claim 2 , the steel sheet having the chemical composition further containing, by mass %, one, two, or more selected from V: 0.01% to 0.50%, B: 0.0003% to 0.0030%, Mg: 0.0005% to 0.0100%, Ca: 0.0003% to 0.0030%, Y: 0.001% to 0.20%, and REM (rare-earth metal); 0.001% to 0.10%. 
     
     
         5 . The ferritic stainless steel sheet according to  claim 1 , the steel sheet having the chemical composition further containing, by mass %, one or both selected from Sn: 0.001% to 0.50% and Sb: 0.001% to 0.50%. 
     
     
         6 . The ferritic stainless steel sheet according to  claim 2 , the steel sheet having the chemical composition further containing, by mass %, one or both selected from Sn: 0.001% to 0.50% and Sb: 0.001% to 0.50%. 
     
     
         7 . The ferritic stainless steel sheet according to  claim 3 , the steel sheet having the chemical composition further containing, by mass %, one or both selected from Sn: 0.001% to 0.50% and Sb: 0.001% to 0.50%. 
     
     
         8 . The ferritic stainless steel sheet according to  claim 4 , the steel sheet having the chemical composition further containing, by mass %, one or both selected from Sn: 0.001% to 0.50% and Sb: 0.001% to 0.50%.