Title:
STEEL PLATE AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/162571
Kind Code:
A1
Abstract:
Provided is a high-strength steel plate which has excellent ammonia SCC resistance and low-temperature toughness, and is used for storage tanks for storing liquefied gas in energy transport ships. The steel plate: has a predetermined composition; has hardness properties in which the average hardness is 230 HV0.1 or less and the hardness variation is 30 HV0.1 or less at a depth of 0.5 mm from the surface of the steel plate, the maximum hardness in the plate thickness direction is at a position of 1.0 mm or more and 1/4 or less of the plate thickness from the surface of the steel plate, and the hardness variation in the plate thickness direction is 70 HV1 or less; and has a metal structure in which the volume fraction of a bainite structure at a depth of 0.5 mm from the surface of the steel plate is 90% or more.
Inventors:
YASUDA KYONO (JP)
SHIOTANI KAZUHIKO (JP)
SHIOTANI KAZUHIKO (JP)
Application Number:
PCT/JP2023/002491
Publication Date:
August 31, 2023
Filing Date:
January 26, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/02; C22C38/00; C22C38/06; C22C38/60
Domestic Patent References:
| WO2020067210A1 | 2020-04-02 | |||
| WO2020067209A1 | 2020-04-02 | |||
| WO2018181564A1 | 2018-10-04 | |||
| WO2018179512A1 | 2018-10-04 |
Foreign References:
| JP2020193374A | 2020-12-03 | |||
| JP2020193375A | 2020-12-03 | |||
| JP2013139630A | 2013-07-18 | |||
| JP2008025014A | 2008-02-07 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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