| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel material having superior corrosion resistance for a ballast tank, which contributes to the reduction of an economic loss such as a maintenance cost of a ship and an extension of a period in a dock (time loss), and further to the enhancement of the safety of the ship, and to provide a ship having the ballast tank made from the steel material. SOLUTION: The steel material having superior corrosion resistance for a ballast tank comprises 0.01 to 0.30% (which means wt.%, hereinafter the same) C, 0.01 to 2.0% Si, 0.01 to 2.0% Mn, 0.01% or less P, 0.0005 to 0.005% or less S, 0.005 to 0.10% Al, 0.1 to 1.0% Cu, 0.01 to 1.0% Ni, 0.01 to 0.5% Cr, and the balance Fe with unavoidable impurities; and has a structure which is mainly formed of ferrite, includes bainite and martensite of less than 30% by an area rate, and includes sulfide-based inclusions with an average particle diameter of 0.5 to 10μm. The ship has the ballast tank made from the above steel material for the ballast tank. COPYRIGHT: (C)2008,JPO&INPIT
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