Title:
STEEL PLATE
Document Type and Number:
WIPO Patent Application WO/2023/053827
Kind Code:
A1
Abstract:
Provided is a steel plate having a prescribed chemical composition satisfying 0.40[Pr] + 0.37[Sm] + 0.37[Eu] + 0.36[Gd] + 0.35[Tb] + 0.34[Dy] + 0.34[Ho] + 0.33[Er] + 0.33[Tm] + 0.32[Yb] + 0.32[Lu] + 1.24[Sc] - 2.33[O] - 3.99[N] - 1.74[S] ≥ 0.0003 (in the formula, [Pr], [Sm], [Eu], [Gd], [Tb], [Dy], [Ho], [Er], [Tm], [Yb], [Lu], [Sc], [O], [N], and [S] represent the content [mass%] of respective elements), in which: the amount of P included in phosphides as measured by an extraction residue method is 0.0003 at% or more with respect to the steel plate; the average particle size of phosphides as measured by the TEM replica method is less than 100 nm; the effective crystal grain size is not more than 5.0 μm; and the plate thickness is not more than 4.0 mm.
Inventors:
NAKADA KOHEI (JP)
TOYODA TAKESHI (JP)
ISHIKAWA KYOHEI (JP)
TOYODA TAKESHI (JP)
ISHIKAWA KYOHEI (JP)
Application Number:
PCT/JP2022/032642
Publication Date:
April 06, 2023
Filing Date:
August 30, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/58; C21D9/46
Domestic Patent References:
| WO2022145067A1 | 2022-07-07 | |||
| WO2022145065A1 | 2022-07-07 |
Foreign References:
| JP2016003385A | 2016-01-12 | |||
| JP2015190058A | 2015-11-02 | |||
| JP2010100923A | 2010-05-06 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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