Title:
THIN STEEL SHEET AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2018/043453
Kind Code:
A1
Abstract:
Provided are: a thin steel sheet having a tensile strength of 950 MPa or higher and satisfactory toughness; and a process for producing the thin steel sheet.
The thin steel sheet is characterized by having a specific composition and a metallographic structure that comprises up to 30% (including 0%) by area ferrite, at least 70% (including 100%) by area tempered martensite, and up to 4.5% (including 0%) by area retained austenite, the tempered martensite grains containing iron-based carbide grains precipitated therein, wherein 10% of the iron-based carbide grains ranging from the largest in grain diameter have an average aspect ratio of 3.5 or higher.
Inventors:
KOHSAKA NORIAKI (JP)
SUZUKI YOSHIKAZU (JP)
KIKUCHI TAKEO (JP)
HIMEI YOSHIMASA (JP)
SUZUKI YOSHIKAZU (JP)
KIKUCHI TAKEO (JP)
HIMEI YOSHIMASA (JP)
Application Number:
PCT/JP2017/030846
Publication Date:
March 08, 2018
Filing Date:
August 29, 2017
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C18/00; C22C18/04; C22C38/06; C22C38/60
Domestic Patent References:
| WO2016132680A1 | 2016-08-25 | |||
| WO2016103534A1 | 2016-06-30 | |||
| WO2014185405A1 | 2014-11-20 | |||
| WO2014077294A1 | 2014-05-22 |
Foreign References:
| JP2012031466A | 2012-02-16 | |||
| JP2010132945A | 2010-06-17 |
Other References:
See also references of EP 3473741A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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