Fe-Cr-Al stainless steel having high oxidation resistance and spalling resistance and Fe-Cr-Al steel for catalyst substrate of catalytic converter
AssigneeKawasaki Steel Corporation
InventorsKazuhide Ishii, Tatsuo Kawasaki
Life of this patent
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Abstract
A high oxidotion resistance Fe-Cr-Al alloy stainless steel foil suitable for forming catalytic converters, specifically for forming automotive catalytic converters. The alloy includes: C: less than or equal to 0.02 Wt %; Si: less than or equal to 1.0 Wt %; Cr: in a range greater than or equal to 14 Wt % to less than or equal to 27 Wt %; Al: in a range greater than or equal to 3.5 Wt % to less than or equal to 6.5 Wt %; La: in a range greater than 0.05 Wt % and less than or equal to 0.20 Wt %; Ce: less than or equal to 0.01 Wt % and the remainder being composed of Fe and inevitable impurities, the foil having a thickness less than or equal to 80 .mu.m.
Claims11
A high oxidation resistantive Fe-Cr-Al stainless steel foil comprising:
- C:
- less than or equal to 0.02 Wt%;
- Si:
- less than or equal to 1.0 Wt%;
- Cr:
- in a range of greater than or equal to 14 Wt% and less than or equal to 27 Wt%;
- Al:
- in a range of greater than or equal to 3.5 Wt% and less than or equal to 6.5 Wt%;
- La:
- in a range of greater than 0.05 Wt% and less than or equal to 0.20 Wt%;
- Ce:
- less than or equal to 0.01%;
- and
- Fe and inevitable impurities as a remainder, said foil having a thickness less than or equal to 80 .mu.m.
A high oxidation resistantive Fe-Cr-Al stainless steel foil comprising:
- C:
- less than or equal to 0.02 Wt%;
- Si:
- less than or equal to 1.0 Wt%;
- Cr:
- in a range of greater than or equal to 14 Wt% and less than or equal to 27 Wt%;
- Al:
- in a range of greater than or equal to 3.5 Wt% and less than or equal to 6.5 Wt%;
- La:
- in a range of greater than 0.05 Wt% and less than or equal to 0.20 Wt%;
- Ce:
- less than or equal to 0.01 Wt%;
- Ti:
- in a content greater than or equal to 5-times the content of C and less than or equal to 0.10 Wt%;
- and
- Fe and inevitable impurities as a remainder, said foil having a thickness less than or equal to 80 .mu.m.
A high oxidation resistantive Fe-Cr-Al stainless steel foil comprising:
- C:
- less than or equal to 0.02 Wt%;
- Si:
- less than or equal to 1.0 Wt%;
- Cr:
- in a range of greater than or equal to 14 Wt% and less than or equal to 27 Wt%;
- Al;
- in a range of greater than or equal to 3.5 Wt% and less than or equal to 6.5 Wt%;
- La:
- in a range of greater than 0.06 Wt% and less than or equal to 0.20 Wt%;
- Ce:
- in a content less than or equal to 0.01 Wt%;
- lanthanides other than La and Ce in a content greater than or equal to 0.001 Wt% and less than 0.03 Wt%, and an overall content of the lanthanides including La and Ce less than or equal to 0.20 Wt%;
- and
- Fe and inevitable impurities as a remainder, said foil having a thickness less than or equal to 80 .mu.m.
A high oxidation resistantive Fe-Cr-Al stainless steel foil comprising:
- C:
- less than or equal to 0.02 Wt%;
- Si:
- less than or equal to 1.0 Wt%;
- Cr:
- in a range of greater than or equal to 14 Wt% and less than or equal to 27 Wt%;
- Al:
- in a range of greater than or equal to 3.5 Wt% and less than or equal to 6.5 Wt%;
- La:
- in a range of greater than 0.06 Wt% and less than or equal to 0.20 Wt%;
- Ce:
- less than or equal to 0.01%;
- and
- Fe and inevitable impurities as a remainder, said foil having a thickness less than or equal to 80 .mu.m.
A high oxidation resistantive Fe-Cr-Al stainless steel foil comprising:
- C:
- less than or equal to 0.02 Wt%;
- Si:
- less than or equal to 1.0 Wt%;
- Cr:
- in a range of greater than or equal to 14 Wt% and less than or equal to 27 Wt%;
- Al:
- in a range of greater than or equal to 3.5 Wt% and less than or equal to 6.5 Wt%;
- La:
- in a range of greater than 0.06 Wt% and less than or equal to 0.20 Wt%;
- Ti:
- in a content greater than or equal to 5-times of content of C and less than or equal to 0.10 Wt%;
- and
- Ce:
- in a content less than or equal to 0.01 Wt%;
- lanthanides other than La and Ce in a content greater than or equal to 0.001 Wt% and less than 0.03 Wt%, and an overall content of the lanthanides including La and Ce less than or equal to 0.20 Wt%;
- and
- Fe and inevitable impurities as a remainder, said foil having a thickness less than or equal to 80 .mu.m.
Dependencies are inferred from the claim text.