| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel material for a crude oil tank that is excellent in both general corrosion resistance in a top plate of a crude oil tank, such as a tanker tank part, and local corrosion resistance in a bottom plate of the crude oil tank.SOLUTION: A steel material for a crude oil tank contains, by mass%, 0.03-0.18% of C, 0.03-1.50% of Si, 0.1-2.0% of Mn, 0.025% or less of P, 0.010% or less of S, 0.005-0.10% of Al, 0.008% or less of N, 0.05-0.4% of Cu, and the balance being Fe and inevitable impurities. The dislocation density of the steel material is 1×10/mor less. |
