Title:
STEEL MATERIAL FOR LINE PIPES AND PRODUCTION METHOD THEREFOR, AND STEEL TUBE FOR LINE PIPES AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/071357
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide: a steel material for line pipes and a production method therefor, the steel material for line pipes being suitable for steel structures used in high pressure hydrogen gas environments, such as line pipes for 100% hydrogen gas or natural gas including hydrogen gas with a hydrogen partial pressure of 1 MPa or more (natural gas is gas having a hydrocarbon such as methane or ethane as the main component), and having high strength and an excellent hydrogen embrittlement resistant property against a high pressure hydrogen gas environments; and a steel tube for line pipes and a production method therefor. The steel material for line pipes has a specific chemical composition, and has an area fraction of retained austenite of 0-3%, a hydrogen diffusion coefficient at room temperature of 1.5×10-10 m2/s or more, and a hydrogen solid solubility of 0.05 mass ppm/√P or less.
Inventors:
OKANO HIROSHI (JP)
NISHIHARA YOSHIHIRO (JP)
INOUE NAHO (JP)
IZUMI DAICHI (JP)
NISHIHARA YOSHIHIRO (JP)
INOUE NAHO (JP)
IZUMI DAICHI (JP)
Application Number:
PCT/JP2023/035559
Publication Date:
April 04, 2024
Filing Date:
September 28, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C21D8/10; C22C38/60
Domestic Patent References:
| WO2020137812A1 | 2020-07-02 | |||
| WO2014156187A1 | 2014-10-02 | |||
| WO2019064459A1 | 2019-04-04 | |||
| WO2022030818A1 | 2022-02-10 | |||
| WO2022209896A1 | 2022-10-06 |
Foreign References:
| JP2022068942A | 2022-05-11 | |||
| JP2012122103A | 2012-06-28 | |||
| JP2018012855A | 2018-01-25 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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