Title:
HIGH-STRENGTH STEEL PLATE AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2018/151023
Kind Code:
A1
Abstract:
Provided are a high-strength steel plate and a method for manufacturing the same. The high-strength steel plate includes a prescribed component composition, with the remainder being Fe and inevitable impurities. The steel composition is 20.0 – 60.0% ferrite by area ratio, 40.0 – 80.0% hard phase formed from bainitic ferrite, tempered martensite, quenched martensite, and retained austenite by total area ratio, 35.0 – 55.0% of the total hard phase by area ratio being bainitic ferrite, 20.0 – 40.0% of the total hard phase by area ratio being tempered martensite, 3.0 – 15.0% of the total hard phase by area ratio being quenched martensite, and 5.0 – 20.0% of the total hard phase by area ratio being retained austenite, the amount of C in the retained austenite being 0.6% percent by mass or greater, and the ratio of the amount of C in the tempered martensite to the amount of C in the quenched martensite being 0.2 or greater and less than 1.0.
Inventors:
MINAMI HIDEKAZU (JP)
KOBAYASHI TAKASHI (JP)
KANEKO SHINJIRO (JP)
TANAKA YUJI (JP)
KOBAYASHI TAKASHI (JP)
KANEKO SHINJIRO (JP)
TANAKA YUJI (JP)
Application Number:
PCT/JP2018/004515
Publication Date:
August 23, 2018
Filing Date:
February 09, 2018
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/06; C22C38/60; C23C2/02; C22C18/04
Domestic Patent References:
| WO2013051238A1 | 2013-04-11 | |||
| WO2016113788A1 | 2016-07-21 | |||
| WO2016113789A1 | 2016-07-21 |
Foreign References:
| JP2009209451A | 2009-09-17 | |||
| JP5888471B1 | 2016-03-22 | |||
| JP5369663B2 | 2013-12-18 |
Other References:
See also references of EP 3584342A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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