Title:
STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2023/162507
Kind Code:
A1
Abstract:
Provided is a high-strength steel sheet having excellent low-temperature toughness and resistance to ammonia SCC, the steel sheet being provided to a storage tank, or similar, that is used to accommodate a liquefied gas in an energy transport vessel. This steel sheet has a specific component composition which contains in particular one or more of Cu: 0.01-05%, Cr: 0.01-1.0%, Sb: 0.01-0.50% and Sn: 0.01-0.50%, the content of Cu, Cr, Sb and Sn satisfying a specific relationship. Said steel sheet has: a hardness property wherein the hardness at a position at a depth of 1.0 mm from the surface of the steel sheet is Hv300 or less; and a metal structure in which, at a position equal to half the sheet thickness of the steel sheet, the volume fraction of bainite structure is 20% or more, and the total volume fraction of ferrite structure and bainite structure is 60% or more.
Inventors:
YASUDA KYONO (JP)
SHIOTANI KAZUHIKO (JP)
SHIOTANI KAZUHIKO (JP)
Application Number:
PCT/JP2023/001049
Publication Date:
August 31, 2023
Filing Date:
January 16, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/02; C22C38/00; C22C38/60
Domestic Patent References:
| WO2021106368A1 | 2021-06-03 |
Foreign References:
| JPS5530062B2 | 1980-08-08 | |||
| JP2019214751A | 2019-12-19 | |||
| JP2011105963A | 2011-06-02 | |||
| JP2020012168A | 2020-01-23 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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