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Title:
HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2019/009410
Kind Code:
A1
Abstract:
The hot-rolled steel sheet according to one embodiment of the present invention is configured such that: the steel sheet has a prescribed chemical composition; at a depth position 1/4 of the sheet thickness from the surface, the area ratio of ferrite is 10–55%; the total area ratio of bainite and martensite is 45–90%; the total area ratio of the ferrite, the bainite and the martensite is at least 90%; and the average crystal grain diameter is 12.0 µm or less. In the texture measured at a section that is central in the sheet thickness direction, the maximum pole density in the {100} <011>, {211} <011>, {311} <011>, {110} <011>, and {332} <113> orientation groups is 8.0 or less and the total pole density of {211} <011> and {332} <113> is 10.0 or less, and the tensile strength is at least 950 MPa.

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Inventors:
YOSHIDA MITSURU (JP)
KOJIMA NOBUSATO (JP)
KANZAWA YUUKI (JP)
KAMIYA KOHHEI (JP)
Application Number:
PCT/JP2018/025687
Publication Date:
January 10, 2019
Filing Date:
July 06, 2018
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C38/14; C22C38/58
Domestic Patent References:
WO2012161248A12012-11-29
WO2013047819A12013-04-04
WO2012133540A12012-10-04
WO2012133563A12012-10-04
WO2012144567A12012-10-26
WO2012133636A12012-10-04
WO2012141265A12012-10-18
WO2012141290A12012-10-18
WO2012161241A12012-11-29
WO2013125399A12013-08-29
WO2015162932A12015-10-29
WO2017085841A12017-05-26
Foreign References:
JP2016008310A2016-01-18
JP2017133889A2017-08-03
JP2008255484A2008-10-23
JP2014205890A2014-10-30
JP2009084648A2009-04-23
Other References:
See also references of EP 3650569A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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