Ferritic stainless steel sheet having superior workability at room temperatures and mechanical characteristics at high temperatures
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United States of America Patent
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Feb 18, 2003
Grant Date -
Mar 28, 2002
app pub date -
Jul 25, 2001
filing date -
Jul 25, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A ferritic stainless steel sheet which has not only superior high-temperature fatigue characteristics, but also superior workability at room temperatures. The steel sheet contains, by weight percent, C: not more than 0.02%, Si: 0.2 to 1.0%, Mn: not more than 1.5%, Cr: 11.0 to 20.0%, Ni: 0.05 to 2.0%, Mo: 1.0 to 2.0%, Al: not more than 1.0%, Nb: 0.2 to 0.8%, and N: not more than 0.02%, balance essentially Fe, and an aspect ratio (d.sub.RD /d.sub.TD) of grain size in planes at 1/4 and 3/4 sheet thickness, seen a direction normal to a sheet surface, in the range of 1.03 to 1.35. The steel sheet has a thickness greater than 0.3 mm but not greater than 2.5 mm, and a yield strength Y.S..ltoreq.360 MPa and an r-value.gtoreq.1.3 at 30.degree. C., and wherein after maintaining the steel sheet at 900.degree. C. for one hour, the Y.S..gtoreq.18.0 MPa.
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