Ferritic stainless steel foil and method for manufacturing the same (as amended)

Abstract

Provided are a ferritic stainless steel foil excellent in terms of corrugating workability, shape change resistance at a high temperature, and manufacturability and a method for manufacturing the steel foil. A ferritic stainless steel foil having a chemical composition containing, by mass % , C: 0.020% or less, Si: 2.0% or less, Mn: 1.0% or less, S: 0.010% or less, P: 0.050% or less, Cr: 10.0% or more and 25.0% or less, Ni: 0.05% or more and 0.50% or less, Ti: 0.14% or more and 0.25% or less, Al: 0.001% or more and 0.10% or less, V: 0.02% or more and 0.10% or less, N: 0.020% or less, and the balance being Fe and inevitable impurities, and a Vickers hardness of higher than 200 and lower than 350.

1 . A ferritic stainless steel foil having a chemical composition containing, by mass % , C: 0.020% or less, Si: 2.0% or less, Mn: 1.0% or less, S: 0.010% or less, P: 0.050% or less, Cr: 10.0% or more and 25.0% or less, Ni: 0.05% or more and 0.50% or less, Ti: 0.14% or more and 0.25% or less, Al: 0.001% or more and 0.10% or less, V: 0.02% or more and 0.10% or less, N: 0.020% or less, and the balance being Fe and inevitable impurities, and a Vickers hardness of higher than 200 and lower than 350. 
     
     
         2 . The ferritic stainless steel foil according to  claim 1 , the foil having the chemical composition further containing, by mass % , one, two, or all of Mo: 0.01% or more and 0.50% or less, Cu: 0.01% or more and 0.30% or less, and Co: 0.01% or more and 0.20% or less. 
     
     
         3 . The ferritic stainless steel foil according to  claim 1 , the foil having the chemical composition further containing, by mass % , one, two, or more of Nb: 0.01% or more and 0.20% or less, REM: 0.01% or more and 0.20% or less, Zr: 0.01% or more and 0.20% or less, Hf: 0.01% or more and 0.20% or less, Ca: 0.0003% or more and 0.0020% or less, and Mg: 0.0005% or more and 0.0030% or less. 
     
     
         4 . The ferritic stainless steel foil according to  claim 1 , the foil being used for a catalyst carrier for an exhaust gas purifying facility used for an exhaust gas whose highest temperature is 800° C. or lower. 
     
     
         5 . A method for manufacturing the ferritic stainless steel foil according to  claim 1 , the method comprising
 performing hot rolling on a heated steel slab to form a hot-rolled steel sheet,   performing cold rolling on the hot-rolled steel sheet,   performing annealing on the cold-rolled steel sheet, and   performing cold rolling on the annealed steel sheet with a final rolling reduction of 50% or more and 95% or less.   
     
     
         6 . The ferritic stainless steel foil according to  claim 2 , the foil having the chemical composition further containing, by mass % , one, two, or more of Nb: 0.01% or more and 0.20% or less, REM: 0.01% or more and 0.20% or less, Zr: 0.01% or more and 0.20% or less, Hf: 0.01% or more and 0.20% or less, Ca: 0.0003% or more and 0.0020% or less, and Mg: 0.0005% or more and 0.0030% or less. 
     
     
         7 . The ferritic stainless steel foil according to  claim 2 , the foil being used for a catalyst carrier for an exhaust gas purifying facility used for an exhaust gas whose highest temperature is 800° C. or lower. 
     
     
         8 . The ferritic stainless steel foil according to  claim 3 , the foil being used for a catalyst carrier for an exhaust gas purifying facility used for an exhaust gas whose highest temperature is 800° C. or lower. 
     
     
         9 . The ferritic stainless steel foil according to  claim 6 , the foil being used for a catalyst carrier for an exhaust gas purifying facility used for an exhaust gas whose highest temperature is 800° C. or lower. 
     
     
         10 . A method for manufacturing the ferritic stainless steel foil according to  claim 2 , the method comprising
 performing hot rolling on a heated steel slab to form a hot-rolled steel sheet,   performing cold rolling on the hot-rolled steel sheet,   performing annealing on the cold-rolled steel sheet, and   performing cold rolling on the annealed steel sheet with a final rolling reduction of 50% or more and 95% or less.   
     
     
         11 . A method for manufacturing the ferritic stainless steel foil according to  claim 3 , the method comprising
 performing hot rolling on a heated steel slab to form a hot-rolled steel sheet,   performing cold rolling on the hot-rolled steel sheet,   performing annealing on the cold-rolled steel sheet, and   performing cold rolling on the annealed steel sheet with a final rolling reduction of 50% or more and 95% or less.   
     
     
         12 . The method for manufacturing the ferritic stainless steel foil according to  claim 6 , the method comprising
 performing hot rolling on a heated steel slab to form a hot-rolled steel sheet,   performing cold rolling on the hot-rolled steel sheet,   performing annealing on the cold-rolled steel sheet, and   performing cold rolling on the annealed steel sheet with a final rolling reduction of 50% or more and 95% or less.