Ferritic stainless steel sheet

Abstract

A ferritic stainless steel sheet is provided. The ferritic stainless steel includes, in mass %, C: 0.020% or less, Si: 0.05 to 0.50%, Mn: 0.05 to 0.50%, P: 0.040% or less, S: 0.030% or less, Al: 0.001 to 0.150%, Cr: 18.0 to 25.0%, Ti: 0.01 to 0.50%, Ca: 0.0001 to 0.0015%, O (oxygen): 0.0015 to 0.0040%, and N: 0.025% or less, with the balance being Fe and incidental impurities. The ferritic stainless steel sheet further satisfies formula (1), below: 0.5≤PBI≤20.0 . . . (1) (where PBI=(7Al+2Ti+Si+10Zr+130Ca)×O (oxygen)×1000, and Al, Ti, Si, Zr, Ca, and O (oxygen) in the formula each represent a content [mass %] of a corresponding element in the ferritic stainless steel sheet, and the content of an element not included in the ferritic stainless steel sheet is 0).

1 . A ferritic stainless steel sheet comprising, in mass %,
 C: 0.020% or less,   Si: 0.05 to 0.50%,   Mn: 0.05 to 0.50%,   P: 0.040% or less,   S: 0.030% or less,   Al: 0.001 to 0.150%,   Cr: 18.0 to 25.0%,   Ti: 0.01 to 0.50%,   Ca: 0.0001 to 0.0015%,   O (oxygen): 0.0015 to 0.0040%, and   N: 0.025% or less, with the balance being Fe and incidental impurities,   the ferritic stainless steel sheet further satisfying formula (1), below:
   0.5≤PBI≤20.0  (1)
 
   (where PBI=(7Al+2Ti+Si+10Zr+130Ca)×O (oxygen)×1000, and Al, Ti, Si, Zr, Ca, and O (oxygen) in the formula each represent a content [mass %] of a corresponding element in the ferritic stainless steel sheet, and a content of an element not contained in the ferritic stainless steel sheet is 0).   
     
     
         2 . The ferritic stainless steel sheet according to  claim 1 , further comprising, in mass %, at least one selected from
 Zr: 0.01 to 0.80%,   Nb: 0.01% or greater and less than 0.40%, and   V: 0.01 to 0.50%.   
     
     
         3 . The ferritic stainless steel sheet according to  claim 1  or  2 , further comprising, in mass %, at least one selected from
 Cu: 0.30 to 0.80%, 
 Ni: 0.01 to 2.50%, 
 Co: 0.01 to 0.50%, 
 Mo: 0.01 to 2.00%, and 
 W: 0.01 to 0.50%. 
 
     
     
         4 . The ferritic stainless steel sheet according to  claim 2 , further comprising, in mass %, at least one selected from
 Cu: 0.30 to 0.80%,   Ni: 0.01 to 2.50%,   Co: 0.01 to 0.50%,   Mo: 0.01 to 2.00%, and   W: 0.01 to 0.50%.   
     
     
         5 . The ferritic stainless steel sheet according to  claim 1 , further comprising, in mass %, at least one selected from
 B: 0.0003 to 0.0030%,   Mg: 0.0005 to 0.0100%,   Y: 0.001 to 0.20%,   REM (rare earth metal): 0.001 to 0.10%,   Sn: 0.01 to 0.50%, and   Sb: 0.01 to 0.50%.   
     
     
         6 . The ferritic stainless steel sheet according to  claim 2 , further comprising, in mass %, at least one selected from
 B: 0.0003 to 0.0030%,   Mg: 0.0005 to 0.0100%,   Y: 0.001 to 0.20%,   REM (rare earth metal): 0.001 to 0.10%,   Sn: 0.01 to 0.50%, and   Sb: 0.01 to 0.50%.   
     
     
         7 . The ferritic stainless steel sheet according to  claim 3 , further comprising, in mass %, at least one selected from
 B: 0.0003 to 0.0030%,   Mg: 0.0005 to 0.0100%,   Y: 0.001 to 0.20%,   REM (rare earth metal): 0.001 to 0.10%,   Sn: 0.01 to 0.50%, and   Sb: 0.01 to 0.50%.   
     
     
         8 . The ferritic stainless steel sheet according to  claim 4 , further comprising, in mass %, at least one selected from
 B: 0.0003 to 0.0030%,   Mg: 0.0005 to 0.0100%,   Y: 0.001 to 0.20%,   REM (rare earth metal): 0.001 to 0.10%,   Sn: 0.01 to 0.50%, and   Sb: 0.01 to 0.50%.   
     
     
         9 . The ferritic stainless steel sheet according to  claim 1 , wherein the ferritic stainless steel sheet has low susceptibility to exfoliation of black spots in a weld zone during bending.