| 摘要 |
Disclosed are: a welded joint which exhibits excellent localized corrosion resistance in a crude oil tank; and a crude oil tank equipped with the welded joint. Specifically disclosed is a crude oil tank equipped with a welded joint, wherein the welded joint is produced by welding steel materials to each other, wherein each of the steel materials comprises (in mass%) 0.03 to 0.16% of C, 0.05 to 1.50% of Si, 0.1 to 2.0% of Mn, 0.025% or less of P, 0.010% or less of S, 0.005 to 0.10% of Al, 0.008% or less of N, more than 0.1% and not more than 0.5% of Cr, 0.03 to 0.4% of Cu, at least one element selected from W (0.01 to 1.0%), Mo (0.01 to 0.5%), Sn (0.001 to 0.2%) and Sb (0.001 to 0.4%), a welded metal produced by the welding contains Cu in an amount of 0.05 to 0.5 mass% and Mo and W in the total amount of 0.03 to 1.0 mass%, and wherein the difference between the corrosion potential of each of the steel materials and the corrosion potential of the welded metal is 60 mV or less. |
