High strength steel sheet and method for manufacturing the same

Details High strength steel sheet and method for manufacturing the same High strength steel sheet and method for manufacturing the same

2011-06-07

2011-06-07

Yee, Deborah (Department: 1733)

Metal treatment

Stock

Ferrous

C148S320000, C148S602000, C148S531000, C148S533000, C428S659000, C428S653000

Reexamination Certificate

active

07955444

ABSTRACT:
A high tensile steel sheet having 980 MPa or higher tensile strength with excellent elongation and stretch-flange formability, suitable for the press-forming of complex cross sectional shape such as automobile parts, is manufactured by adjusting the steel to consist essential of a ferrite single phase structure, to precipitate carbide containing Ti, Mo, and V, of smaller than 10 nm of average particle size, in dispersed state, and to have an average composition of the carbide containing Ti, Mo, and V satisfying [V/(Ti+Mo+V)≧0.3 (atomic ratio].

REFERENCES:
patent: 06-172924 (1994-06-01), None
patent: 06-2003511 (1994-07-01), None
patent: 2002-322539 (2002-11-01), None
patent: 2003-089848 (2003-03-01), None
patent: 2004-143518 (2004-05-01), None
patent: 2005-002406 (2005-01-01), None
patent: 2005-120430 (2005-05-01), None
Machine-English translation of Japanese patent 2003-089848, Mar. 28, 2003, Shiozaki Takeshi et al.

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