Coated ferrite stainless steel sheet usable in the automobile exhaust sector
AssigneeUsinor
InventorsLaurent Antoni, Raphael Craen
Life of this patent
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Abstract
Dip-coated ferrite stainless steel sheet usable in the automobile exhaust sector, characterized in that it comprises a steel core with the following composition by weight: 10.5%≦chromium≦20% 0%≦aluminum≦0.6% 0.003%≦carbon≦0.06% 0.003%≦nitrogen≦0.04% 0%≦silicon≦0.6% 0%≦manganese≦0.6% 0%≦sulfur≦0.002% iron and impurities inherent in processing, and a metal coating deposited by dipping the strip in a molten metal bath containing in particular aluminum and at least one rare earth element: cerium, lanthanum, praseodymium, neodymium, mixed metal and/or yttrium.
Claims25
A dip-coated ferritic stainless steel sheet usable in an automobile exhaust sector comprising a steel core with the following composition by weight:
- 10.5%<chromium≦20%;
- 0%≦aluminum≦0.6%;
- 0.003%≦carbon≦0.06%;
- 0.003%≦nitrogen≦0.03%;
- 0%≦silicon≦0.6%;
- 0%≦manganese≦0.6%;
- 0%≦sulfur≦0.002%;
- and
- the balance iron and impurities inherent in processing, and
- a metal coating deposited on said steel core, wherein said metal coating comprises aluminum and at least one element selected from the group consisting of cerium, lanthanum, praseodymium and neodymium, and wherein said metal coating is deposited by dipping said steel core in a molten metal bath comprising aluminum and said at least one element selected from the group consisting of cerium, lanthanum, praseodymium and neodymium.
A dip-coated ferritic stainless steel sheet usable in an automobile exhaust sector comprising a steel core with the following composition by weight:
- 10.5%≦chromium≦20%
- 0%≦aluminum≦0.6%
- 0.003%≦carbon≦0.06%
- 0.003%≦nitrogen≦0.03%
- 0%≦silicon≦0.6%
- 0%≦manganese≦0.6%
- 0%≦sulfur≦0.002% and
- the balance iron and impurities inherent in processing, and
- a metal coating deposited on said steel core, wherein said metal coating comprises aluminum and yttrium and wherein said metal coating is deposited by dipping said steel core in a molten metal bath comprising aluminum and yttrium.
A ferritic stainless steel strip containing aluminum having the following composition by weight:
- 10.5%≦chromium≦20%;
- 0%≦aluminum≦8.0%;
- 0.003%≦carbon≦0.06%;
- 0.003%≦nitrogen≦0.03%;
- 0%≦silicon≦0.6%;
- 0%≦manganese≦0.6%;
- 0%≦sulfur≦0.002%;
- 0.001% or greater of an element selected from the group consisting of Ce, La, Pr, Nd and yttrium;
- and
- 1.0% or greater iron and impurities inherent in processing, wherein the chromium and aluminum levels conform to the relationship Cr/%Al<5.
Dependencies are inferred from the claim text.