| 摘要 |
PROBLEM TO BE SOLVED: To provide a welded metal that is superior in hydrogen embrittlement resistance sensitivity even when it has a high strength of a tensile strength being over 780 MPa.SOLUTION: A welded metal has a predetermined chemical composition, in which retained austenite particles are present in the number of 2500/mmor more, a volume fraction of the retained austenite particles is 4.3% or more, and the ratio of content between Cr and Mn in the welded metal, [Cr]/[Mn], is 0.20 or more. |
