Ferritic stainless steel sheet and method of producing same, and al vapor deposited layer-equipped stainless steel sheet

Abstract

A ferritic stainless steel sheet comprises a chemical composition containing, in mass %, C: 0.030% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 11.0% to 30.0%, Al: 8.0% to 20.0%, Ni: 0.05% to 0.50%, Mo: 0.01% to 6.0%, N: 0.020% or less, and at least one selected from the group consisting of Zr: 0.01% to 0.20% and Hf: 0.01% to 0.20%, with a balance consisting of Fe and inevitable impurities.

1 . A ferritic stainless steel sheet comprising:
 a chemical composition containing, in mass %,   C: 0.030% or less,   Si: 1.0% or less,   Mn: 1.0% or less,   P: 0.040% or less,   S: 0.010% or less,   Cr: 11.0% to 30.0%,   Al: 8.0% to 20.0%,   Ni: 0.05% to 0.50%,   Mo: 0.01% to 6.0%,   N: 0.020% or less, and   at least one selected from the group consisting of Zr: 0.01% to 0.20% and Hf: 0.01% to 0.20%,   with a balance consisting of Fe and inevitable impurities; and   a thickness of 100 μm or less.   
     
     
         2 . The ferritic stainless steel sheet according to  claim 1 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of
 REM: 0.01% to 0.20%,   Cu: 0.01% to 0.10%,   Ti: 0.01% to 0.50%,   Nb: 0.01% to 0.50%,   V: 0.01% to 0.50%,   W: 0.01% to 6.0%,   B: 0.0001% to 0.0050%,   Ca: 0.0002% to 0.0100%, and   Mg: 0.0002% to 0.0100%.   
     
     
         3 . An Al vapor deposited layer-equipped stainless steel sheet comprising:
 a base steel sheet; and   an Al vapor deposited layer on a surface of the base steel sheet,   wherein the base steel sheet is a ferritic stainless steel sheet having a thickness of 100 μm or less and a chemical composition containing, in mass %,   C: 0.030% or less,   Si: 1.0% or less,   Mn: 1.0% or less,   P: 0.040% or less,   S: 0.010% or less,   Cr: 11.0% to 30.0%,   Al: 4.0% to 6.5%,   Ni: 0.05% to 0.50%,   Mo: 0.01% to 6.0%,   N: 0.020% or less, and   at least one selected from the group consisting of Zr: 0.01% to 0.20% and Hf: 0.01% to 0.20%,   with a balance consisting of Fe and inevitable impurities, and   a thickness of the Al vapor deposited layer per one side is 0.5 μm to 10.0 μm.   
     
     
         4 . The Al vapor deposited layer-equipped stainless steel sheet according to  claim 3 , wherein the chemical composition of the base steel sheet further contains, in mass %, one or more selected from the group consisting of
 REM: 0.01% to 0.20%,   Cu: 0.01% to 0.10%,   Ti: 0.01% to 0.50%,   Nb: 0.01% to 0.50%,   V: 0.01% to 0.50%,   W: 0.01% to 6.0%,   B: 0.0001% to 0.0050%,   Ca: 0.0002% to 0.0100%, and   Mg: 0.0002% to 0.0100%.   
     
     
         5 . A method of producing a ferritic stainless steel sheet having a thickness of 100 μm or less and a chemical composition containing, in mass %
 C: 0.030% or less, 
 Si: 1.0% or less, 
 Mn: 1.0% or less, 
 P: 0.040% or less, 
 S: 0.010% or less, 
 Cr: 11.0% to 30.0%, 
 Al: 8.0% to 20.0%, 
 Ni: 0.05% to 0.50%, 
 Mo: 0.01% to 6.0%, 
 N: 0.020% or less, and 
 at least one selected from the group consisting of Zr: 0.01% to 0.20% and Hf: 0.01% to 0.20%, 
 with a balance consisting of Fe and inevitable impurities, the method comprising 
 subjecting the Al vapor deposited layer-equipped stainless steel sheet according to  claim 3  to a heat treatment of holding in a temperature range of 600° C. to 1300° C. for 1 minute or more. 
 
     
     
         6 . A method of producing a ferritic stainless steel sheet having a thickness of 100 μm or less and a chemical composition containing, in mass %,
 C: 0.030% or less, 
 Si: 1.0% or less, 
 Mn: 1.0% or less, 
 P: 0.040% or less, 
 S: 0.010% or less, 
 Cr: 11.0% to 30.0%, 
 Al: 8.0% to 20.0%, 
 Ni: 0.05% to 0.50%, 
 Mo: 0.01% to 6.0%, 
 N: 0.020% or less, and 
 at least one selected from the group consisting of Zr: 0.01% to 0.20% and Hf: 0.01% to 0.20%, and 
 one or more selected from the group consisting of 
 REM: 0.01% to 0.20%, 
 Cu: 0.01% to 0.10%, 
 Ti: 0.01% to 0.50%, 
 Nb: 0.01% to 0.50%, 
 V: 0.01% to 0.50%, 
 W: 0.01% to 6.0%, 
 B: 0.0001% to 0.0050%, 
 Ca: 0.0002% to 0.0100%, and 
 Mg: 0.0002% to 0.0100%, 
 with a balance consisting of Fe and inevitable impurities, the method comprising 
 subjecting the Al vapor deposited layer-equipped stainless steel sheet according to  claim 4  to a heat treatment of holding in a temperature range of 600° C. to 1300° C. for 1 minute or more.