Title:
HIGH STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2017/085841
Kind Code:
A1
Abstract:
This high strength hot-rolled steel sheet comprises specific chemical components and has a structure that contains, in area percentage, from 20% to 60% (inclusive) of martensite and 40% or more of ferrite, with the total of the martensite and the ferrite being 90% or more. The martensite has an average particle diameter of from 5.0 μm to 50 μm (inclusive); the ratio of the hardness of the martensite to the hardness of the ferrite is from 0.6 to 1.6 (inclusive); and this high strength hot-rolled steel sheet has a tensile strength of 980 MPa or more.
Inventors:
TOYODA TAKESHI (JP)
KAMADA DAIKI (JP)
KANZAWA YUUKI (JP)
KIKUZUKI MAYUKO (JP)
KAMADA DAIKI (JP)
KANZAWA YUUKI (JP)
KIKUZUKI MAYUKO (JP)
Application Number:
PCT/JP2015/082591
Publication Date:
May 26, 2017
Filing Date:
November 19, 2015
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/14; C22C38/38; C21D9/46
Domestic Patent References:
| WO2006107066A1 | 2006-10-12 | |||
| WO2010061972A1 | 2010-06-03 |
Foreign References:
| JP2015086415A | 2015-05-07 | |||
| JP2010275627A | 2010-12-09 | |||
| JP2009019258A | 2009-01-29 | |||
| JP2007302918A | 2007-11-22 |
Other References:
See also references of EP 3378961A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
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