Title:
STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/149157
Kind Code:
A1
Abstract:
Provided is a thick steel sheet of high strength and excellent multi-pass welded joint CTOD characteristics, even having a thickness exceeding100 mm. A steel sheet with a prescribed component composition and Ti/N, Ceq, and Pcm values in specified ranges, wherein the average effective crystal grain size in the center of the sheet thickness is 20 μm or less, and the number of pores in the steel sheet with an equivalent circle diameter of at least 180 μm per 1 mm2 is 0.10 or less.
Inventors:
OKUTANI MASAOMI (JP)
TERAZAWA YUSUKE (JP)
OHTSUBO HIROFUMI (JP)
TERAZAWA YUSUKE (JP)
OHTSUBO HIROFUMI (JP)
Application Number:
PCT/JP2023/000227
Publication Date:
August 10, 2023
Filing Date:
January 06, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/14; C22C38/58
Domestic Patent References:
| WO2018216665A1 | 2018-11-29 | |||
| WO2021182618A1 | 2021-09-16 | |||
| WO2016035110A1 | 2016-03-10 |
Foreign References:
| JP2007302908A | 2007-11-22 | |||
| JPH0344417A | 1991-02-26 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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