STEEL SHEET, MEMBER, AND METHODS FOR PRODUCING SAME

Title:

STEEL SHEET, MEMBER, AND METHODS FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2021/039776

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide: a steel sheet having high strength and excellent shape uniformity and delayed fracture resistance; a member; and methods for producing the same.　A steel sheet according to the present invention has a steel structure comprising, by area ratio, 20-100% of martensite, 0-80% of ferrite, and 5% or less of the remainder, wherein: the residual stress at the sheet width center is 800 MPa or less when a V-shaped bending process is performed; the residual stress at the sheet width edge with respect to the residual stress at the sheet width center is 90-110% when the V-shaped bending process is performed; and when the steel sheet is cut with a length of 1 m in the longitudinal direction thereof, the maximum warpage of the steel sheet is at most 15 mm.

Inventors:

HIRASHIMA TAKUYA (JP)
YOSHIOKA SHIMPEI (JP)
KANEKO SHINJIRO (JP)
YOSHIMOTO SOSHI (JP)
HASHIMUKAI TOMOHIRO (JP)
ONO YOSHIHIKO (JP)

Application Number:

PCT/JP2020/031994

Publication Date:

March 04, 2021

Filing Date:

August 25, 2020

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; C21D1/18; C21D1/63; C21D9/46; C21D9/573; C22C38/06; C22C38/60

Domestic Patent References:

WO2016084283A1	2016-06-02
WO2018123356A1	2018-07-05
WO2020026838A1	2020-02-06
WO2020090302A1	2020-05-07

Foreign References:

JP2003277833A	2003-10-02
JPH11193418A	1999-07-21
JP2010090432A	2010-04-22
JPH0238532A	1990-02-07
JP2020019992A	2020-02-06
JP2010090432A	2010-04-22
JP6094722B2	2017-03-15

Other References: