Title:
STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/166934
Kind Code:
A1
Abstract:
The present invention provides a steel sheet which exibits excellent ammonia stress corrosion cracking properties, low-temperature toughness and strength characteristics, and in which reductions in flatness are suppressed, and a method for manufacturing the same. This steel sheet has a predetermined component composition, and is configured such that: the carbon equivalent (Ceq) of the component composition is 0.340-0.390; the volume fraction of the sum of ferrite and pearlite of the microstructure at a position at 1/4 of the sheet thickness is 90% or more; the average particle diameter of the ferrite is 5-20 μm; the yield strength of the steel sheet is 440 MPa or less and the tensile strength is 490 MPa or more; the maximum value of the gap between the steel sheet surface and a 2 m long ruler is 14 mm or less when the long ruler is applied to the steel sheet surface along the rolling direction; and the sheet thickness is less than 13 mm.
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Inventors:
TAKAYAMA NAOKI (JP)
HIRAIDE TAKASHI (JP)
SATO YUYA (JP)
TACHIBANA SHUNICHI (JP)
HIRAIDE TAKASHI (JP)
SATO YUYA (JP)
TACHIBANA SHUNICHI (JP)
Application Number:
PCT/JP2023/004275
Publication Date:
September 07, 2023
Filing Date:
February 09, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/02; C22C38/00; C22C38/06; C22C38/58
Domestic Patent References:
WO2020184683A1 | 2020-09-17 |
Foreign References:
JPH11131178A | 1999-05-18 | |||
JP2011105963A | 2011-06-02 | |||
JP2020509174A | 2020-03-26 | |||
JP2019214751A | 2019-12-19 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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