| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a coated steel excellent in corrosion resistance and capable of suppressing the influence by corrosive actions of seawater or the like even if being used as the structural member of a structure in a seawater corrosive environment or the like.SOLUTION: Provided is a coated steel obtained by forming a water-insoluble coating film on the surface side of a steel comprising 0.04 to 0.30% C, 0.05 to 1.0% Si, 0.1 to 2.0% Mn, 0.03% or lower of P, 0.03% or lower of S, 0.005 to 0.10% Al, 0.05 to 0.5% Cu, 0.05 to 0.5% Cr, 0.001 to 0.010% N and one or more kinds selected from 0.005 to 0.05% Ti and 0.005 to 0.05% Nb, in which an alkali metal-concentrated region in which the average concentration of the total of alkali metals is 0.1 to 1.0% is formed at the thickness region of 10μm from the steel side of the coating film.</p> |
