STEEL HAVING EXCELLENT SEASIDE WEATHER RESISTANCE AND STRUCTURE

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PROBLEM TO BE SOLVED : To provide a low-cost steel having excellent seaside weather resistance and capable of exhibiting excellent weather resistance even in a severe corrosive environment where the amount of flying salt exceeds 1 mdd (mg/dm2/day). SOLUTION : The steel has a composition comprising, by mass, 0.001 to 0.15% C, ≤2.5% Si, >0.5 to 2.5% Mn, <0.03% P, ≤0.005% S, 0.05 to 1.0% Cu, 0.01 to 0.5% Ni, 0.01 to 3.0% Cr, 0.003 to 2.5% Al, and 0.001 to 0.1% N, Sn and/or Sb of 0.03 to 0.50%, further comprising one or more kinds of metals selected from 0.01 to 0.3% Ti, 0.01 to 0.1% Nb, 0.01 to 1.0% Mo, 0.01 to 1.0% W, 0.01 to 1.0% V, 0.0001 to 0.1% Ca, 0.0001 to 0.1% Mg and 0.0001 to 0.02% rare earth metals, and the balance Fe with impurities, and in which the mass ratio of Ni/Cu is ≤0.5. The surface of the steel may be coated with a corrosion prevention coating. COPYRIGHT : (C)2006, JPO&NCIPI