| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a welded joint excellent in localized corrosion resistance in a crude oil tank, and the crude oil tank with the welded joint. <P>SOLUTION: The crude oil tank has the welded joint formed by welding together steel products, wherein each contains, in mass%, C of 0.03-0.16%, S of 0.05-1.50%, Mn of 0.1-2.0%, P of not more than 0.025%, S of not more than 0.010%, Al of 0.005-0.01%, N of not more than 0.008%, Cr of more than 0.1% and not more than 0.5%, Cu of 0.03-0.4%, and contains one or two or more kinds selected from W of 0.01-1.0%, Mo of 0.01-0.5%, Sn of 0.001-0.2% and Sb of 0.001-0.4%, a welded metal contains Cu of 0.05-0.5% and (Mo+W) of 0.03-1.0%, and a difference between a corrosion potential of the steel product and a corrosion potential of the welded metal is not more than 60 mV. <P>COPYRIGHT: (C)2012,JPO&INPIT |
