Title:
STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2023/162522
Kind Code:
A1
Abstract:
The present invention provides a high-strength steel sheet which has exceptional ammonia SCC resistance and low-temperature toughness, and is used for a storage tank in which a liquefied gas is stored in an energy transport ship, or the like. This steel sheet has a specific component composition and hardness characteristics such that the average hardness is Hv 210 or less at a depth of 0.5 mm from the steel sheet surface and the variation of the average hardness is Hv 50 or less, while having a metal structure which has a volume ratio of bainite structure of 90% or more at a depth of 0.5 mm from the steel sheet surface, while having a volume ratio of bainite structure of 20% or more and a total volume ratio of ferrite structure and bainite structure of 60% or more at 1/2 the sheet thickness of the steel sheet.
Inventors:
YASUDA KYONO (JP)
TAKAYAMA NAOKI (JP)
SHIOTANI KAZUHIKO (JP)
TAKAYAMA NAOKI (JP)
SHIOTANI KAZUHIKO (JP)
Application Number:
PCT/JP2023/001392
Publication Date:
August 31, 2023
Filing Date:
January 18, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/02; C22C38/00; C22C38/06; C22C38/60
Domestic Patent References:
| WO2021106368A1 | 2021-06-03 |
Foreign References:
| JP2021088753A | 2021-06-10 | |||
| JP2011208222A | 2011-10-20 | |||
| JP2011105963A | 2011-06-02 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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