Title:
LINE PIPE STEEL MATERIAL HAVING EXCELLENT HYDROGEN EMBRITTLEMENT RESISTANCE, MANUFACTURING METHOD THEREFOR, LINE PIPE STEEL TUBE HAVING EXCELLENT HYDROGEN EMBRITTLEMENT RESISTANCE, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/071356
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a line pipe steel material that is suitable for use in a steel structure used in a high-pressure hydrogen gas environment, such as a line pipe for 100% hydrogen gas or a natural gas (natural gas being a gas having a hydrocarbon such as methane or ethane as a primary component) containing hydrogen having a hydrogen partial pressure of at least 1 MPa, and that has high strength and excellent hydrogen embrittlement resistance in a high-pressure hydrogen gas environment. The purpose of the present invention is also to provide a manufacturing method therefor, as well as a line pipe steel tube and a manufacturing method therefor. Provided is a line pipe steel material having excellent hydrogen embrittlement resistance that has a specific chemical composition and a specific structure, wherein the fatigue limit stress in hydrogen that is at 1 MPa or higher is at least 200 MPa, and the ratio of the fatigue limit stress in hydrogen that is at 1 MPa or higher to the fatigue limit stress in an inert gas environment is at least 0.90.
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/JP2023/035558
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
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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