Title:
COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/037878
Kind Code:
A1
Abstract:
The present invention is a cold-rolled steel sheet characterized by having a prescribed chemical composition and being such that: a steel structure is, in terms of areal percentage, 90.0-99.5% martensite, 0-5% ferrite, and 0.5-7.0% residual austenite, the remainder being bainite; the percentage of tempered martensite in the total martensite is 80-100%; the maximum value of a curvature 1/R represented by formula (1) below and obtained by measuring the shape of a region equal to the full width by a length of 300 mm is 0.010 or less; and the tensile strength is 1470 MPa or more.
Inventors:
YOKOYAMA TAKAFUMI (JP)
HIROSE SATOSHI (JP)
TSURUOKA HIROYUKI (JP)
HIROSE SATOSHI (JP)
TSURUOKA HIROYUKI (JP)
Application Number:
PCT/JP2022/031939
Publication Date:
March 16, 2023
Filing Date:
August 24, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D9/46; B21B1/22; C22C38/00; C22C38/60
Domestic Patent References:
| WO2021039776A1 | 2021-03-04 | |||
| WO2020090302A1 | 2020-05-07 | |||
| WO2011118459A1 | 2011-09-29 |
Foreign References:
| JP2013227657A | 2013-11-07 | |||
| JP2016050343A | 2016-04-11 | |||
| JP2016153524A | 2016-08-25 | |||
| JP2011202195A | 2011-10-13 | |||
| JP2013227657A | 2013-11-07 |
Other References:
"Special Report No. 36: Theory and Practice of Sheet Rolling", 2010, IRON AND STEEL INSTITUTE OF JAPAN, pages: 264
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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