Title:
STEEL SHEET WITH HIGH TENSILE STRENGTH AND SUPERIOR DUCTILITY AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2011/122237
Kind Code:
A1
Abstract:
Disclosed is a steel sheet with high tensile strength and superior ductility having tensile strength of 700 - 900 MPa and capable of avoiding abrupt failure during press molding and method for producing the same. The steel sheet with high tensile strength and superior ductility is characterized by having a composition containing 0.5 - 1.5% C, 0.1% or less Si, 10 - 25% Mn, 0.1% or less P, 0.05% or less S, 0.1% or less Al, 3.0 - 8.0% Ni, 0.1% or less Mo, and 0.01% or less N (% by mass), with the remainder being Fe and unavoidable impurities and by having recrystallized austenite particles with an average particle diameter of 5 - 30 µm or, further, a microstructure formed from another structure with an areal proportion of 1% or less.
Inventors:
KOBAYASHI TAKASHI (JP)
FUNAKAWA YOSHIMASA (JP)
MEGA TETSUYA (JP)
FUNAKAWA YOSHIMASA (JP)
MEGA TETSUYA (JP)
Application Number:
PCT/JP2011/055007
Publication Date:
October 06, 2011
Filing Date:
February 25, 2011
Export Citation:
Assignee:
JFE STEEL CORP (JP)
KOBAYASHI TAKASHI (JP)
FUNAKAWA YOSHIMASA (JP)
MEGA TETSUYA (JP)
KOBAYASHI TAKASHI (JP)
FUNAKAWA YOSHIMASA (JP)
MEGA TETSUYA (JP)
International Classes:
C22C38/00; B21B3/00; C21D9/46; C22C38/12
Foreign References:
| JPH05171273A | 1993-07-09 | |||
| JPH04259325A | 1992-09-14 | |||
| JP2009120962A | 2009-06-04 | |||
| JPH04259325A | 1992-09-14 | |||
| JP2004521192A | 2004-07-15 | |||
| JP2006528278A | 2006-12-14 | |||
| JPH05171273A | 1993-07-09 |
Other References:
See also references of EP 2554699A4
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JP)
Ken-ichiro Ochiai (JP)
Ken-ichiro Ochiai (JP)
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Claims: