STEEL MATERIAL

Claims

A steel material is provided that has high strength and excellent resistance to hydrogen embrittlement. In a steel material according to the present disclosure, the chemical composition consists of, in % by mass, C: 0.25 to 0.30%, Si: 0.10 to 0.50%, Mn: 0.05 to 0.60%, P: 0.050% or less, S: 0.0100% or less, Al: 0.001 to 0.100%, Cr: 0.50 to 1.50%, Mo: 0.80 to 2.00%, Ti: 0.002 to 0.010%, V: 0.08 to 0.30%, Nb: 0.010 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0100% or less, and O: 0.0100% or less, with the balance being with Fe and impurities. In the steel material, a tensile strength of 900 to 1100 MPa, a pre-austenite grain size of 20.0 µm or less, a dislocation density of 7.0 × 10 14 m -2 or less, and a Q value obtained from an X-ray diffraction line profile of 2.35 or more.