High-strength cold-rolled steel sheet having outstanding...

Details High-strength cold-rolled steel sheet having outstanding... High-strength cold-rolled steel sheet having outstanding...

2008-05-13

2008-05-13

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S334000, C148S320000, C148S328000

Reexamination Certificate

active

11045309

ABSTRACT:
A high-strength cold-rolled steel sheet is disclosed that comprises a steel including C: 0.05 to 0.13 mass %, Si: 0.5 to 2.5 mass %, and Mn: 0.5 to 3.5 mass %, as well as Mo: 0.05 to 0.6 mass % and/or Cr: 0.05 to 1.0 mass %. The steel sheet is of composite structure of a ferrite+a second phase wherein the second phase has an area rate of 30 to 70% and is combined approximately in a shape of a network; a circle-equivalent average ferrite grain size is not more than 10 μm; and a circle-equivalent diameter of ferrite grain aggregate that exists continuously in an area surrounded by the second phase is not more than 3 times of the average ferrite grain size. The steel sheet has a high-strength and satisfies a balance of elongation and stretch flange formability (ratio of hole expansion) at a higher level.

REFERENCES:
patent: 63-241115 (1988-10-01), None
patent: 63-293121 (1988-11-01), None
patent: 9-67645 (1997-03-01), None
patent: 362074024 (1997-04-01), None
patent: 10-237547 (1998-09-01), None
patent: 11-350038 (1999-12-01), None

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