HIGH-TENSION STEEL SHEET AND PROCESS FOR PRODUCING THE SAME

Title:

HIGH-TENSION STEEL SHEET AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2007/018246

Kind Code:

A1

Abstract:

A steel sheet having a tensile strength as high as 980 MPa or above. It has a structure consisting substantially of a ferrite phase only and has dispersed/precipitated carbide particles containing Ti, Mo, and V and having an average particle diameter smaller than 10 nm, the carbides containing Ti, Mo, and V having an average composition satisfying the relationship V/(Ti+Mo+V)≥0.3 (atomic ratio). The steel sheet is excellent in both elongation and stretch flangeability, and is suitable for use in applications where the sheet is pressed so as to have a complicated sectional shape, as in the formation of automotive members.

Inventors:

ARIGA TAMAKO (JP)
YOKOTA TAKESHI (JP)
KOBAYASHI AKIO (JP)
SETO KAZUHIRO (JP)

Application Number:

PCT/JP2006/315772

Publication Date:

February 15, 2007

Filing Date:

August 03, 2006

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
ARIGA TAMAKO (JP)
YOKOTA TAKESHI (JP)
KOBAYASHI AKIO (JP)
SETO KAZUHIRO (JP)

International Classes:

C21D9/46; C22C38/00; C22C38/14; C23C2/06

Foreign References:

JP2005002406A	2005-01-06
JP2005120430A	2005-05-12
JP2005120430A	2005-05-12

Other References: