Ferritic stainless steel sheet excellent in heat resistance and workability and method of production of same

Abstract

The present invention provides ferritic stainless steel sheet which is excellent in heat resistance at 950° C. and workability at ordinary temperature, that is, ferritic stainless steel sheet excellent in heat resistance and workability which is characterized by containing, by mass %, C: 0.02% or less, N: 0.02% or less, Si: over 0.1 to 1.0%, Mn: 0.5% or less, P: 0.020 to 0.10%, Cr: 13.0 to 20.0%, Nb: 0.5 to 1.0%, Cu: 1.0 to 3.0%, Mo: 1.5 to 3.5%, W: 2.0% or less, B: 0.0001 to 0.0010%, and Al: 0.01 to 1.0% and having a balance of Fe and unavoidable impurities, where Mo+W is made 2.0 to 3.5%.

1 . Ferritic stainless steel sheet excellent in heat resistance and workability characterized by containing, by mass %, C: 0.02% or less, N: 0.02% or less, Si: over 0.1 to 1.0%, Mn: 0.5% or less, P: 0.020 to 0.10%, Cr: 13.0 to 20.0%, Nb: 0.5 to 1.0%, Cu: 1.0 to 3.0%, Mo: 1.5 to 3.5%, W: 2.0% or less, B: 0.0001 to 0.0010%, and Al: 0.01 to 1.0% and having a balance of Fe and unavoidable impurities, where Mo+W is 2.0 to 3.5%. 
     
     
         2 . Ferritic stainless steel sheet excellent in heat resistance and workability of  claim 1  characterized by further containing, by mass %, one or more of Ti: 0.05 to 0.4%, V: 0.05 to 1.0%, Zr: 0.05 to 1.0%, Sn: 0.05 to 0.5%, and Ni: 0.05 to 1.0%. 
     
     
         3 . Method of production of ferritic stainless steel sheet excellent in heat resistance and workability characterized by producing ferritic stainless steel sheet as set forth in  claim 1  or  2  during which water cooling a steel sheet within one hour after hot rolling and coiling and cold rolling and annealing the cold rolled steel sheet while omitting annealing of hot rolled steel sheet. 
     
     
         4 . Method of production of ferritic stainless steel sheet excellent in heat resistance and workability characterized by producing ferritic stainless steel sheet as set forth in  claim 1  or  2  during which water cooling a steel sheet within one hour after hot rolling and coiling, annealing the hot rolled steel sheet in a 700 to 950° C. non-recrystallization region, and cold rolling and annealing the cold rolled steel sheet.