Method of producing ferritic stainless steel sheet
A method of producing a ferritic stainless steel sheet comprises subjecting an Al vapor deposited layer-equipped stainless steel sheet to a heat treatment at 600° C. to 1300° C. for 1 minute or more. The Al vapor deposited layer-equipped stainless steel sheet comprises a ferritic stainless steel and an Al vapor deposited layer thereon. The ferritic stainless steel sheet has a thickness of 100 μm or less and a chemical composition containing, in mass %, C: ≤0.030%, Si: ≤1.0%, Mn: ≤1.0%, P: ≤0.040%, S: ≤0.010%, Cr: 11.0-30.0%, Al: 4.0-6.5%, Ni: 0.05-0.50%, Mo: 0.01-6.0%, N: ≤0.020% s, and Zr: 0.01-0.20% and/or Hf: 0.01-0.20%, with a balance consisting of Fe and inevitable impurities. A thickness of the Al vapor deposited layer per one side is 0.5-10.0 μm.
1 . A method of producing a ferritic stainless steel sheet having a thickness of 100 μm or less and a chemical composition consisting of, 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: 10.9% 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 an Al vapor deposited layer-equipped stainless steel sheet to a heat treatment of holding in a temperature range of 600° C. to 1300° C. for 1 minute or more,
wherein the 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 consisting of, 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.
2 . The method according to claim 1 , wherein Al content of the chemical composition of the base steel sheet is 5.5 mass % to 6.5 mass %.
3 . A method of producing a ferritic stainless steel sheet having a thickness of 100 μm or less and a chemical composition consisting of, 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: 10.9% 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%,
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 an Al vapor deposited layer-equipped stainless steel sheet to a heat treatment of holding in a temperature range of 600° C. to 1300° C. for 1 minute or more,
wherein the 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 consisting of, 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%, 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%,
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, and
a thickness of the Al vapor deposited layer per one side is 0.5 μm to 10.0 μm.
4 . The method according to claim 3 , wherein Al content of the chemical composition of the base steel sheet is 5.5 mass % to 6.5 mass %.