Metal treatment – Stock – Ferrous
Reexamination Certificate
2009-04-09
2011-12-06
Yee, Deborah (Department: 1733)
Metal treatment
Stock
Ferrous
C148S332000, C148S333000, C148S334000, C148S335000, C148S336000, C148S518000, C148S533000, C148S651000, C148S652000
Reexamination Certificate
active
08070889
ABSTRACT:
The invention is directed to providing, for application in automobiles, construction materials, household appliances and the like, high-strength sheets excellent in formability properties such as hole expansibility and ductility, and also in fatigue resistance, characterized in comprising, in specified contents expressed in mass %, C, Si, Mn, P, S, Al, N and O and a balance of iron and unavoidable impurities, and having a steel sheet structure composed mainly of ferrite and hard structures, a crystal orientation difference between some ferrite adjacent to hard structures and the hard structures of less than 9°, and a maximum tensile strength of 540 MPa or greater.
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Azuma Masafumi
Maruyama Naoki
Murasato Akinobu
Suzuki Noriyuki
Yoshinaga Naoki
Kenyon & Kenyon LLP
Nippon Steel Corporation
Yee Deborah
LandOfFree
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