Title:
COLD-ROLLED STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2016/152163
Kind Code:
A1
Abstract:
A cold-rolled steel sheet has a structure: which has a prescribed component composition; in which the total area ratio of tempered martensite and bainite with respect to the structure as a whole is 95% to 100%; in which there are not more than 0.8/mm2 of prescribed inclusion groups that extend and/or are distributed in a series of points in the rolling direction and are configured from at least one inclusion particle with a long axis of at least 0.3 µm; in which there are not more than 3500/mm2 of carbides of a prescribed size that have Fe as the main component; in which there are at least 0.7 × 107/mm2 of carbides of 10-50 nm diameter that distribute in the interior of the tempered martensite and/or bainite; and in which the mean particle size of prior γ grains is not more than 18 µm.
Inventors:
ONO YOSHIHIKO (JP)
FUNAKAWA YOSHIMASA (JP)
YAMAGUCHI RYOSUKE (JP)
NAKAMURA NOBUYUKI (JP)
FUNAKAWA YOSHIMASA (JP)
YAMAGUCHI RYOSUKE (JP)
NAKAMURA NOBUYUKI (JP)
Application Number:
PCT/JP2016/001695
Publication Date:
September 29, 2016
Filing Date:
March 23, 2016
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/06; C22C38/60
Foreign References:
| JP2010215958A | 2010-09-30 | |||
| JP2010275608A | 2010-12-09 | |||
| JP2012237048A | 2012-12-06 |
Other References:
See also references of EP 3276022A4
Attorney, Agent or Firm:
SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)
Kenji Sugimura (JP)
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