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Title:
HIGH-STRENGTH STEEL PLATE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/147400
Kind Code:
A1
Abstract:
Provided are: a high-strength steel plate having a tensile strength greater than or equal to 1180 MPa; and a method for manufacturing the high-strength steel plate. The high-strength steel plate contains a prescribed component composition, and the remainder of the high-strength steel plate is composed of Fe and unavoidable impurities. The steel structure contains tempered martensite at an area percentage of 75.0% or more, hardened martensite at an area percentage of 1.0-20.0%, and retained austenite at an area percentage of 5.0-20.0%. A hardness ratio of the hardened martensite to the tempered martensite is 1.5-3.0. A ratio of the maximum KAM value on the tempered martensite side in the vicinity of a different-phase interface between the tempered martensite and the hardened martensite to the average KAM value in the tempered martensite is 1.5-30.0. With respect to prior austenite grains, the average value of a ratio of the grain diameter in the rolling direction to the grain diameter in the plate thickness direction is 2.0 or less.

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Inventors:
MINAMI HIDEKAZU (JP)
SHIIMORI FUSAE (JP)
KANEKO SHINJIRO (JP)
KOBAYASHI TAKASHI (JP)
TANAKA YUJI (JP)
Application Number:
PCT/JP2018/004513
Publication Date:
August 16, 2018
Filing Date:
February 09, 2018
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/06; C22C38/60; C22C18/04
Foreign References:
JP2015200012A2015-11-12
JP2011080106A2011-04-21
JP2010255090A2010-11-11
JP2010255091A2010-11-11
JP2016008310A2016-01-18
JP2014080665A2014-05-08
JP2015034327A2015-02-19
JP5884210B12016-03-15
JP5896086B12016-03-30
Other References:
See also references of EP 3581670A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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