Steel material for high-pressure hydrogen gas environment, steel structure for high-pressure hydrogen gas environment, and methods for producing steel material for high-pressure hydrogen gas environment
AssigneeJfe Steel Corporation
InventorAkihide NAGAO
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Abstract
A steel material and methods for producing the same. The steel material exhibits excellent hydrogen embrittlement resistance in a high-pressure hydrogen gas environment and is, therefore, suitable for use in hydrogen storage tanks, hydrogen line pipes, and the like. The steel material has a specified chemical composition, a tensile strength of 560 MPa or higher, and a fracture toughness value KIH exhibited by the steel material in a high-pressure hydrogen gas atmosphere is 40 MPa·m1/2 or higher.
Claims22
A steel material for a high-pressure hydrogen gas environment, the steel material having a chemical composition comprising, by mass %:
- C:
- 0.04 to 0.50%;
- Si:
- 0.5 to 2.0%;
- Mn:
- 0.5 to 2.0%;
- P:
- 0.05% or less;
- S:
- 0.010% or less;
- N:
- 0.0005 to 0.0080%;
- Al:
- 0.010% to 2.0%;
- O:
- 0.0100% or less;
- Cu:
- 0.5 to 2.0%;
- and
- the balance being Fe and incidental impurities,
- wherein the steel material has a tensile strength of 560 MPa or higher, and
- a fracture toughness value KIH exhibited by the steel material in a high-pressure hydrogen gas atmosphere is 40 MPa·m1/2 or higher.
(canceled)
11-12. (canceled)
Dependencies are inferred from the claim text.