| 摘要 |
In a steel sheet pile according to the present invention, a carbon equivalent CE N is 0.260 to 0.500, a structure includes a ferrite, a pearlite, a Widmanstätten ferrite, and a precipitate, the precipitate is one or both of Nb carbonitride and V carbonitride, a total number density of the precipitate is 0.10 to 0.30 pieces/µm 2 , a total area ratio of the ferrite and the pearlite is 70% or more, an area ratio of the Widmanstätten ferrite is 1% or more, an average grain size of the ferrite and the pearlite is 10 to 80µm, and a yield strength is 460MPa or more. |
