High strength cold rolled steel sheet and method for...

Details High strength cold rolled steel sheet and method for... High strength cold rolled steel sheet and method for...

2004-11-26

2009-10-27

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S330000, C148S333000, C148S334000, C148S335000, C148S336000, C148S332000, C148S651000

Reexamination Certificate

active

07608156

ABSTRACT:
This disclosure relates to a high strength cold rolled steel sheet composed of ferrite grains having an average grain diameter of 10 μm or less, in which the average number per unit area of Nb(C, N) precipitates having a diameter of 50 nm or more is 7.0×10−2/μm2or less, and a zone having a width of 0.2 to 2.4 μm and an average area density of NbC precipitates of 60% or less of that of the central portion of the ferrite grains is formed along grain boundaries of the ferrite grains, for example, the steel sheet consisting of 0.004 to 0.02% of C, 1.5% or less of Si, 3% or less of Mn, 0.15% or less of P, 0.02% or less of S, 0.1 to 1.5% of sol.Al, 0.001 to 0.007% of N, 0.03 to 0.2% of Nb, by mass, and the balance of Fe and inevitable impurities. The steel sheet is most preferably used for automobile panel parts since it has the TS of 340 MPa or more and the superior surface strain resistance and press formability.

REFERENCES:
patent: 6911268 (2005-06-01), Takada et al.
patent: 0 816 524 (1998-01-01), None
patent: 0 885 978 (1998-12-01), None
patent: 1 146 132 (2001-10-01), None
patent: 1 318 205 (2003-06-01), None
patent: 55-58347 (1980-05-01), None
patent: 02-80539 (1990-03-01), None
patent: 05-287547 (1993-11-01), None
patent: 06-330180 (1994-11-01), None

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