Title:
STEEL MATERIAL HAVING EXCELLENT FATIGUE CHARACTERISTICS IN HYDROGEN, METHOD FOR PRODUCING SAME, STEEL PIPE, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2024/071353
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide: a steel material which has excellent fatigue characteristics in a high-pressure hydrogen gas environment and is suitable for use in a steel structure, which is used in the high-pressure hydrogen gas environment, such as a line pipe for 100% hydrogen gas or natural gas (which is gas mainly composed of hydrocarbons such as methane and ethane) that contains hydrogen having a hydrogen partial pressure of 1 MPa or more; a method for producing the steel material; a steel pipe; and a method for manufacturing the steel pipe. The steel material has a specific component composition and a specific structure, and has excellent fatigue characteristics in hydrogen, wherein the crack growth rate da/dN at a stress intensity factor (= 20 MPa√m) in hydrogen of at least 1 MPa is at most 1.0×10-6m·cycle-1.
Inventors:
INOUE NAHO (JP)
OKANO HIROSHI (JP)
NISHIHARA YOSHIHIRO (JP)
IZUMI DAICHI (JP)
OKANO HIROSHI (JP)
NISHIHARA YOSHIHIRO (JP)
IZUMI DAICHI (JP)
Application Number:
PCT/JP2023/035555
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 | |||
| WO2017047099A1 | 2017-03-23 | |||
| 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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