Ferritic stainless steel and use thereof in the manufacture for high temperature resistant products
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United States of America Patent
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Issued Date -
Dec 30, 2004
app pub date -
Aug 20, 2004
filing date -
Sep 26, 2001
priority date (Note) -
Abandoned
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Abstract
Ferritic stainless steel, comprising the following Chemical elements expressed in percentage by weight: --Cr 14.0-20.0 --Al 0.50-1.50 --Zr 0.10-0.50 --Si 0.30-1.50 --Ti 0.10-0.35 --Nb 0.25-0.55 --C<0.035 --N<0.035 provided that the content of Ti, Nb, C and N satisfy the following relation: %Ti+%Nb/1.94>9 (%C+%N) and substantially iron q. s. to 100. This steel may also comprise Yttrium and/or rare earth elements in a percentage by weight comprised in the range 0.10-0.30. The invention also encompasses products manufacturable with the steel of the invention, in particular vehicle exhaust manifold systems. Figure (I) shows a cyclic oxidation test carried out at 1000.degree. C. on samples having the composition of an embodiment of the steel according to the invention.
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