Title:
STEEL SHEET PILE AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/259697
Kind Code:
A1
Abstract:
According to the present invention, a steel sheet pile having high strength and high toughness is stably provided with high productivity. This steel sheet pile has: a predetermined component composition; a microstructure in which the area fraction of ferrite is at least 70% and the area ratio of island-shaped martensite is at most 1.0%; and a microstructure in which the area fraction of ferrite is at least 70% and the area ratio of island-shaped martensite is at most 1.0%, the total area ratio of V carbonitrides, Nb carbonitrides, and V-Nb composite carbonitrides that have a particle size of at most 10 nm is at least 2.6%, and the area ratio of V carbonitrides, Nb carbonitrides, and a composite deposit thereof that have a predetermined particle size of d (nm) is at least 0.3%. The average particle size and greatest particle size of the ferrite are at most 15 μm and at most 40 μm, respectively.
Inventors:
ASAHI KENTA (JP)
ANDO KEISUKE (JP)
OHTSUBO HIROFUMI (JP)
ANDO KEISUKE (JP)
OHTSUBO HIROFUMI (JP)
Application Number:
PCT/JP2022/013720
Publication Date:
December 15, 2022
Filing Date:
March 23, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21B1/082; C22C38/00; C21D8/00; C22C38/12; C22C38/58
Foreign References:
| JP2008221318A | 2008-09-25 | |||
| JPH101721A | 1998-01-06 | |||
| JP2002294392A | 2002-10-09 | |||
| JP2018090845A | 2018-06-14 | |||
| CN111187981A | 2020-05-22 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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