High tensile strength steel sheet excellent in...

Details High tensile strength steel sheet excellent in... High tensile strength steel sheet excellent in...

2004-08-30

2008-11-25

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C420S008000, C420S120000, C428S659000, C148S533000, C148S651000

Reexamination Certificate

active

07455736

ABSTRACT:
A high tensile strength steel sheet excellent in processibility which can satisfy a strength, a total elongation, and stretch-flanging property (hole enlarging rate) at a further high level. and comprises a matrix microstructure of tempered martensite or tempered bainite and, if necessary, ferrite, and a second phase of retained austenite, wherein (1) the steel comprising C: 0.10 to 0.6 mass %, Si: 1.0 mass % or smaller, Mn: 1.0 to 3 ,mass %, Al: 0.3 to 2.0 mass %, P: 0.02 mass % or smaller, S: 0.03 mass % or smaller, (2) a volume rate of retained austenite obtained by a saturated magnetization measuring method is 5 to 40% by area (whole field is 100%), and (3) a relationship of a carbon amount (C: weight %) in the steel, a volume rate (fγR) of retained austenite and a carbon concentration (CγR) of the retained austenite satisfies the equation:in-line-formulae description="In-line Formulae" end="lead"?(fγR×CγR)/C≧50 .   (I)in-line-formulae description="In-line Formulae" end="tail"?

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