HOT ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Title:

HOT ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Document Type and Number:

WIPO Patent Application WO/2018/151273

Kind Code:

A1

Abstract:

Provided is a hot rolled steel sheet having superior impact characteristics with excellent toughness and little anisotropy. The hot rolled steel sheet is characterized by: including 0.10 – 0.50% C, 0.10 – 3.00% Si, 0.5 – 3.0% Mn, 0.100% or less P, 0.010% or less S, 1.00% or less Al, and 0.010% or less N, with the remainder being Fe and impurities; the metal composition at a position 1/4 of the thickness from the surface in cross-section L including prior austenite grains with an aspect ratio average value of 2.0 or less, average grain size of 0.1 – 3.0 µm and a coefficient of variance, which is standard deviation/average grain size for particle distribution, of 0.40 or greater, and a texture with an x-ray diffraction strength ratio for a {001} <110> orientation for random samples being 2.0 or greater; and having tensile strength of 1180 MPa or greater.

Inventors:

TOYODA TAKESHI (JP)
OKAMOTO RIKI (JP)
SUGIURA NATSUKO (JP)
HIRASHIMA TETSUYA (JP)

Application Number:

PCT/JP2018/005570

Publication Date:

August 23, 2018

Filing Date:

February 16, 2018

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

C22C38/00; C21D9/46; C22C38/06; C22C38/38

Domestic Patent References:

WO2014185405A1	2014-11-20
WO2013004910A1	2013-01-10

Foreign References:

JP2011052321A	2011-03-17
JP2006207021A	2006-08-10
JP3858146B2	2006-12-13
JP5068688B2	2012-11-07
JP5556948B1	2014-07-23

Other References: