STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Title:

STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2021/145310

Kind Code:

A1

Abstract:

Provided in the present invention is a steel sheet having a prescribed chemical composition and metallographic structure, in which the ratio A/B of the length A of the interface between epitaxial ferrite and ferrite to the length B of the interface between the epitaxial ferrite and martensite is greater than 1.5 in a cross-section perpendicular to the surface of the steel sheet along the rolling direction and at a position one-quarter of the sheet thickness from the surface of the steel sheet, the ratio of the major axis to the minor axis of the martensite is at least 5.0, and the tensile strength is at least 980 MPa.

More Like This:

JP4385777	Cold-rolled steel sheet with excellent strain age hardening characteristics and its manufacturing method
WO/2017/094876	NITRIDED PLATE COMPONENT AND MANFACTURING METHOD THEREFOR
JP6048382	A high intensity cold-rolled steel plate and a manufacturing method for the same

Inventors:

SUZUKI YUYA (JP)
TAKEDA KENGO (JP)

Application Number:

PCT/JP2021/000703

Publication Date:

July 22, 2021

Filing Date:

January 12, 2021

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NIPPON STEEL CORP (JP)

International Classes:

C21D9/46; C22C38/00; C22C38/60

Domestic Patent References:

WO2009099251A1	2009-08-13
WO2016010144A1	2016-01-21
WO2017195795A1	2017-11-16

Foreign References:

CN102605240A	2012-07-25
JP2020003677A	2020-01-09

Other References: