Metal treatment – Stock – Ferrous
Reexamination Certificate
2008-07-08
2008-07-08
King, Roy (Department: 1793)
Metal treatment
Stock
Ferrous
C148S602000, C420S067000
Reexamination Certificate
active
07396420
ABSTRACT:
The present invention provides a steel sheet having a chemical composition comprising 0.15% or less C, 2.0% or less Si, 3.0% or less Mn, P, S, A1 and N in adjusted amounts, from 0.5 to 3.0% Cu, or one or more of Cr, Mo and W in a total amount of 2.0% or less, and having a composite structure comprising ferrite and martensite having an area ratio of 2% or more. The steel sheet is in the form of a high-strength hot-rolled steel sheet, a high-strength cold-rolled steel sheet, or a hot-dip galvanized steel sheet. There is thus available a steel sheet excellent in press-formability and in strain age hardening property as represented by a ΔTS of 80 MPa or more.
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Furukimi Osamu
Matsuoka Saiji
Sakata Kei
Shimizu Tetsuo
DLA Piper (US) LLP
JFE Steel Corporation
King Roy
Roe Jessee
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