Stainless steel foil for catalyst support of exhaust gas purifier
Provided is a stainless steel foil for a catalyst support of an exhaust gas purifier excellent in both diffusion bonding resistance and brazeability and also excellent in oxidation resistance at high temperatures. The stainless steel foil for a catalyst support of an exhaust gas purifier comprises: a predetermined chemical composition; a parameter Sa defined in ISO 25178 of 0.50 μm to 3.00 μm; and a parameter Str defined in ISO 25178 of 0.20 to 1.00.
1 . A stainless steel foil for a catalyst support of an exhaust gas purifier, comprising:
a chemical composition containing, in mass %,
C: 0.020% or less,
Si: 1.0% or less,
Mn: 1.0% or less,
P: 0.040% or less,
S: 0.004% or less,
Cr: 16.0% to 30.0%,
Al: 2.00 to 6.50%,
N: 0.020% or less,
Ni: 0.50% or less, and
at least one selected from the group consisting of
Ti: 0.30% or less,
Zr: 0.20% or less,
Hf: 0.20% or less, and
REM: 0.20% or less,
with a balance consisting of Fe and inevitable impurities;
a parameter Sa defined in ISO 25178 of 0.50 μm to 3.00 μm; and
a parameter Str defined in ISO 25178 of 0.20 to 1.00.
2 . The stainless steel foil for a catalyst support of an exhaust gas purifier according to claim 1 , wherein the chemical composition further contains, in mass %, at least one selected from the group consisting of
Cu: 0.10% or less,
Nb: 0.30% or less,
V: 0.30% or less,
Ca: 0.0100% or less,
Mg: 0.0100% or less, and
B: 0.0050% or less.
3 . The stainless steel foil for a catalyst support of an exhaust gas purifier according to claim 1 , wherein the chemical composition further contains at least one selected from the group consisting of Mo and W, and
a total content of Mo and W is 6.0 mass % or less.
4 . The stainless steel foil for a catalyst support of an exhaust gas purifier according to claim 1 , comprising
an average grain size of 15 μm or more and 25 μm or less.
5 . The stainless steel foil for a catalyst support of an exhaust gas purifier according to claim 2 , wherein the chemical composition further contains at least one selected from the group consisting of Mo and W, and
a total content of Mo and W is 6.0 mass % or less.
6 . The stainless steel foil for a catalyst support of an exhaust gas purifier according to claim 2 , comprising
an average grain size of 15 μm or more and 25 μm or less.
7 . The stainless steel foil for a catalyst support of an exhaust gas purifier according to claim 3 , comprising
an average grain size of 15 μm or more and 25 μm or less.
8 . The stainless steel foil for a catalyst support of an exhaust gas purifier according to claim 5 , comprising
an average grain size of 15 μm or more and 25 μm or less.
9 . The stainless steel foil for a catalyst support of an exhaust gas purifier according to claim 1 , wherein the parameter Sa defined in ISO 25178 is 1.75 μm to 3.00 μm.