Metal treatment – Stock – Ferrous
Reexamination Certificate
2006-05-29
2010-10-26
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C420S068000, C420S069000, C420S064000
Reexamination Certificate
active
07819991
ABSTRACT:
A ferritic stainless steel sheet for forming a raw material pipe for bellows pipe is excellent in formability and high-temperature properties (high-temperature salt corrosion resistance and high-temperature fatigue properties). Specifically, the ferritic stainless steel sheet for forming a raw material pipe for bellows pipe contains 0.015% by mass or less of C, 1.0% by mass or less of Si, 1.0% by mass or less of Mn, 0.04% by mass or less of P, 0.010% by mass or less of S, 11% to 19% by mass of Cr, 0.015% by mass or less of N, 0.15% by mass or less of Al, 1.25% to 2.5% by mass of Mo, 0.3% to 0.7% by mass of Nb, 0.0003% to 0.003% by mass of B, and the balance being Fe and incidental impurities. In the ferritic stainless steel sheet for forming a raw material pipe for bellows pipe, preferably, the average crystal grain diameter D of the steel sheet is 35 μm or less, and alternatively, the surface roughness Ra of the steel sheet is 0.40 μm or less.
REFERENCES:
patent: 5489345 (1996-02-01), Koike et al.
patent: 5806899 (1998-09-01), Norikawa et al.
patent: 6911098 (2005-06-01), Yazawa et al.
patent: 2002-212683 (1922-07-01), None
patent: 7-268560 (1995-10-01), None
patent: 408060306 (1996-03-01), None
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patent: 8-188854 (1996-07-01), None
patent: 08-283914 (1996-10-01), None
patent: 9-125208 (1997-05-01), None
patent: 2004218013 (2004-08-01), None
Machine-English translation of Japanese patent 08-283914, Takada Takeshi et al., Oct. 29, 1996.
Furukimi Osamu
Hirata Norimasa
Kato Yasushi
Ozaki Yoshihiro
Ujiro Takumi
DLA Piper (LLP) US
JFE Steel Corporation
Yee Deborah
LandOfFree
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