Metal treatment – Stock – Ferrous
Reexamination Certificate
2006-10-03
2009-06-30
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S533000, C148S602000, C148S653000, C148S654000
Reexamination Certificate
active
07553380
ABSTRACT:
Disclosed is a dual-phase steel sheet having low yield ratio, excellent in the balance for strength-elongation and for strength-stretch flange formability, and also excellent in bake hardening property containing (on the mass % basis).C: 0.01-0.20%,Si: 0.5% or less,Mn: 0.5-3%,sol.Al: 0.06% or less (inclusive 0%),P: 0.15% or less (exclusive 0%), andS: 0.02% or less (inclusive 0″), and in whichthe matrix phase contains tempered martensite; tempered martensite and ferrite; tempered bainite; or tempered bainite and ferrite, andthe second phase comprises 1 to 30% of martensite at an area ratio based on the entire structure.
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Akamizu Hiroshi
Asai Tatsuya
Hashimoto Shunichi
Ikeda Shushi
Kashima Takahiro
(Kobe Steel, Ltd.)
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Yee Deborah
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