HOT-ROLLED STEEL SHEET - NIPPON STEEL CORP

Title:

HOT-ROLLED STEEL SHEET

Document Type and Number:

WIPO Patent Application WO/2020/184356

Kind Code:

A1

Abstract:

A hot-rolled steel sheet according to the present invention has a predetermined chemical composition, wherein: when height profiles of the surface of the steel sheet are respectively measured in five measurement ranges in the rolling direction and the direction perpendicular to the rolling direction, and, in each of the height profiles, R1(μm) is the vertical distance to a recessed portion from an average height position which is the position of the average height between the height of the highest vertical position and the height of the recessed portion which is the lowest vertical position, and R2(μm) is the average of the heights of two measurement points separated by 5 μm from the recessed portion in the rolling direction or the direction perpendicular to the rolling direction, the hot-rolled steel sheet has an average value of the radius of curvature r represented by expression (1) of 10 μm or more; and the hot-rolled steel sheet has a tensile strength of 500 MPa or more.　(1): r=(25+|R2-R1|2)/2|R2-R1|.

Inventors:

SHUTO HIROSHI (JP)
ABUKAWA GENKI (JP)
SAKAKIBARA AKIFUMI (JP)
ANDO JUN (JP)
ASATO TETSU (JP)
ENDO SHOTA (JP)

Application Number:

PCT/JP2020/009310

Publication Date:

September 17, 2020

Filing Date:

March 05, 2020

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)

International Classes:

C21D9/46; C22C38/00; C22C38/58

Foreign References:

JP2006316301A	2006-11-24
JP2007211334A	2007-08-23
JP2001334306A	2001-12-04
JP2000140930A	2000-05-23
JP2002346610A	2002-12-03
JPH1177108A	1999-03-23
JP2005296973A	2005-10-27
JP2019043962A	2019-03-22
JP4404004B2	2010-01-27
JP4518029B2	2010-08-04
JP5471918B2	2014-04-16

Other References: