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Title:
HIGH-STRENGTH HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2021/210644
Kind Code:
A1
Abstract:
This high-strength hot-rolled steel sheet has a tensile strength of at least 850 MPa, prescribed chemical components, and an average dislocation density of 1 x 1014 to 1 x 1016 m-2; contains at least bainitic ferrite; has an area percentage for the total of the bainitic ferrite and ferrite of at least 70% but less than 90% and has an area percentage for the total of martensite and retained austenite of 5-30%; and has an average number density of TiC precipitates in the ferrite crystal grains and bainitic ferrite grains of 1 x 1017 to 5 x 1018 [number/cm3]; wherein the amount of Ti present as TiC precipitates that have precipitated in the matrix phase not on dislocations is at least 30 mass% of the total amount of Ti in the steel sheet ([Ti] and [C] represent, respectively, the amount of Ti and the amount of C (mass%).]

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Inventors:
KOBAYASHI YUKIKO (JP)
TAKAHASHI JUN (JP)
YOKOI TATSUO (JP)
OKAMOTO RIKI (JP)
TOYODA TAKESHI (JP)
Application Number:
PCT/JP2021/015587
Publication Date:
October 21, 2021
Filing Date:
April 15, 2021
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/02; C21D9/46; C22C38/00; C22C38/14
Foreign References:
JP2013133534A2013-07-08
JP2017179539A2017-10-05
JP2012001776A2012-01-05
JP2011122188A2011-06-23
JP2015218352A2015-12-07
JP2013124393A2013-06-24
JP2003089848A2003-03-28
JP2007262487A2007-10-11
JP2007247046A2007-09-27
JPH0711382A1995-01-13
JP2013133534A2013-07-08
JP2020074180A2020-05-14
Other References:
G. K. WILLIAMSONR. E. SMALLMAN: "Dislocation densities in some annealed and cold-worked metals from measurements on X-ray Debye-Scherrer spectrum", PHILOSOPHICAL MAGAZINE, vol. 8, 1956, pages 34 - 46
See also references of EP 4137592A4
Attorney, Agent or Firm:
TAIYO, NAKAJIMA & KATO (JP)
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