HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Title:

HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND MANUFACTURING METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2020/158063

Kind Code:

A1

Abstract:

A purpose of the present invention is to provide a high-strength hot-dip galvanized steel sheet that is suitable as a high-strength steel sheet for an energy absorption member of a vehicle, has a tensile strength (TS) of 980 MPa or greater, and has superior breakage resistance during a collision, as well as to provide a manufacturing method for the same.　This high-strength hot-dip galvanized steel sheet has a hot-dip galvanized layer on a surface of the steel sheet and includes, as the component composition thereof by mass%, C: 0.07-0.20%, Si: 0.1-2.0%, Mn: 2.0-3.5%, P: 0.05% or less, S: 0.05% or less, and Sol. Al: 0.005-0.1%, the remainder consisting of Fe and unavoidable impurities, wherein the steel structure by area percentage is ferrite: 60% or less, tempered martensite: 40% or more, and fresh martensite: 10% or less, and the void density of a bent section in a VDA bending test is 1500/mm2 or less.

Inventors:

KOMINE SHINSUKE (JP)
NAKAGAITO TATSUYA (JP)
SATO KENTARO (JP)
SAKAIDANI TOMOHIRO (JP)

Application Number:

PCT/JP2019/041005

Publication Date:

August 06, 2020

Filing Date:

October 18, 2019

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C21D9/46; C22C38/00; C22C38/60

Domestic Patent References:

WO2018073919A1	2018-04-26
WO2014092025A1	2014-06-19
WO2018138898A1	2018-08-02

Foreign References:

JP2011157583A	2011-08-18
JP2017115238A	2017-06-29
JP2012031462A	2012-02-16
JP2015175061A	2015-10-05

Other References: