Method of manufacturing cold rolled dual-phase steel sheet

Details Method of manufacturing cold rolled dual-phase steel sheet Method of manufacturing cold rolled dual-phase steel sheet

2004-11-24

2008-10-28

Yee, Deborah (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S651000, C148S652000, C148S533000

Reexamination Certificate

active

07442268

ABSTRACT:
A steel sheet having (a) a dual phase microstructure with a martensite phase and a ferrite phase and (b) a composition containing by percent weight: 0.01% to 0.2% C; 0.3% to 3% Mn; 0.05% to 2% Si; 0.1% to 2% Cr; 0.01% to 0.10 Al; and 0.0005% to 0.01% Ca, with the balance of the composition being iron and incidental ingredients. Also, the steel sheet is made by a batch annealing method, and has a tensile strength of at least approximately 400 MPa and an n-value of at least approximately 0.175.

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European Patent Office Standard Search Report, mailed Apr. 25, 2007.

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