| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel structure for hydrogen such as an accumulator for hydrogen and a line pipe for hydrogen having excellent hydrogen embrittlement resistance with reducing fatigue crack propagation rate in a high pressure hydrogen environment compared to conventional steels.SOLUTION: There is provided a steel structure for hydrogen excellent in hydrogen embrittlement resistance in a high pressure hydrogen gas having a steel structure with an area ratio of martensite of 10 to 95% and the balance substantially comprising bainite, and containing preferably, by mass%, C:0.10 to 0.50%, Si:0.05 to 0.5%, Mn:0.5 to 2.0%, Al:0.01 to 0.10%, N:0.0005 to 0.008%, P:0.05% or less, S:0.01% or less, O:0.01% or less. |
