Metal treatment – Stock – Ferrous
Reexamination Certificate
2004-06-28
2009-02-03
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S330000, C148S332000, C148S333000, C148S334000, C148S335000, C148S336000, C148S602000, C148S654000, C148S331000
Reexamination Certificate
active
07485195
ABSTRACT:
A high-strength hot-rolled steel sheet excellent in shape fixability having ferrite or bainite as the phase of the largest volume percentage, satisfying all of the following at least at ½ sheet thickness: a mean value of X-ray random intensity ratio in the orientation component group of {100}<011> to {223}<110> to X-ray random diffraction intensity ratio of at least 2.5; a mean value of X-ray random intensity ratio in the three crystal orientation components of {554}<225>, {111}<112>, and {111}<110> to X-ray random diffraction intensity ratio of 3.5 or less; an X-ray intensity ratio to X-ray random diffraction intensity ratio at {100}<011> of at least the X-ray random intensity to X-ray random diffraction intensity ratio at {211}<011>; and an X-ray random intensity ratio to X-ray random intensity ratio diffraction intensity ratio at {100}<011> of at least 2.5, having at least one of an r-value of the rolling direction and an r-value of a direction perpendicular to the rolling direction of not more than 0.7, having an anisotropy ΔuE1 of uniform elongation of not more than 4%, having an anisotropy ΔLE1 of local elongation of at least 2%, and having an ΔuE1 of not more than the ΔLE1.
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Chinese Patent issued Mar. 12, 2008 in corresponding Chinese Patent Application No. CN 200480017463.3.
Kimura Ken
Sugiura Natsuko
Takahashi Manabu
Yoshinaga Naoki
Arcelor France
Kenyon & Kenyon LLP
Nippon Steel Corporation
Yee Deborah
LandOfFree
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