| 摘要 |
PROBLEM TO BE SOLVED: To provide a bolt that has high strength and still exhibits excellent hydrogen embrittlement resistance, and a method for producing the bolt.SOLUTION: A bolt satisfies prescribed componential compositions, and is characterized in that the austenite grain size number of a bolt axis part is ≥9.0 and G value (%) representing the ratio of carbides precipitated in the austenite grain boundary of the bolt axis part satisfies inequality (1): G value: (L/LO)×100≤60 (1); wherein, L denotes the total length of carbides with a thickness of ≥50 nm precipitated in the austenite grain boundary; and LO denotes the length of the austenite grain boundary in the inequality (1). |
