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
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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