Title:
HIGH-STRENGTH THIN STEEL SHEET AND PROCESS FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2013/099235
Kind Code:
A1
Abstract:
According to the present invention, a high-strength thin steel sheet which has a high tensile strength (TS) of 980MPa or higher and which stably exhibits excellent bendability over the whole of the sheet can be obtained. This high-strength thin steel sheet has a prescribed steel composition and a structure wherein: the average ferrite grain diameter is 10μm or less; the volume fraction of ferrite is 30 to 70%; the total volume fraction of martensite and retained austenite is 10% or less; and the ratio of pairs of adjacent phases such that the nano-hardness difference between the adjacent phases of each pair is 4GPa or smaller is 90% or more.
Inventors:
TAKAGI SHUSAKU (JP)
KANEKO SHINJIRO (JP)
KANEKO SHINJIRO (JP)
Application Number:
PCT/JP2012/008307
Publication Date:
July 04, 2013
Filing Date:
December 26, 2012
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; B21B3/00; C21D9/46; C22C38/06; C22C38/58; C23C2/02; C23C2/06; C23C2/28
Foreign References:
| JP2011231377A | 2011-11-17 | |||
| JP2011179050A | 2011-09-15 | |||
| JP2010255091A | 2010-11-11 | |||
| JP2008308717A | 2008-12-25 | |||
| JP2006022390A | 2006-01-26 | |||
| JP2002053935A | 2002-02-19 | |||
| JPH02175839A | 1990-07-09 | |||
| JPH05195149A | 1993-08-03 | |||
| JPH10130782A | 1998-05-19 | |||
| JP2005273002A | 2005-10-06 | |||
| JP2009167467A | 2009-07-30 | |||
| JP2008280608A | 2008-11-20 | |||
| JP2006052458A | 2006-02-23 |
Other References:
See also references of EP 2799568A4
Attorney, Agent or Firm:
SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)
Kenji Sugimura (JP)
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Claims: