STEEL MATERIAL

Claims

A steel material is provided that has high strength and excellent pitting resistance in a high H2S environment. A steel material according to this disclosure consists of, in % by mass, C: 0.20 to 0.35%, Si: 0.10 to 1.50%, Mn: 0.05 to 0.55%, P: 0.050% or less, S: 0.0100% or less, Cr: 0.20 to 1.00%, Mo: 0.20 to 1.50%, Ti: 0.003 to 0.030%, Al: 0.010 to 0.100%, N: 0.0100% or less, and O: 0.0050% or less, with the balance being Fe and impurities, and has a yield strength of 758 to less than 965 MPa. In the microstructure, the standard deviation of the grain size number of previous austenite grains is 0.80 or less.