| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel material for a vessel having excellent corrosion resistance (particularly, durability to coercive corrosion) to be utilizable even without applying coating and electrolytic protection in an environment exposed to salt and high temperature-high humidity caused by seawater, and further having excellent HAZ (heat affected zone) toughness upon high heat input welding. SOLUTION: The steel material for a vessel having excellent corrosion resistance and HAZ toughness upon high heat input welding has a composition comprising, by mass, 0.01 to 0.2% C, 0.01 to 1% Si, 0.01 to 2% Mn, 0.005 to 0.1% Al, 0.005 to 0.03% Ti and 0.003 to 0.015% N, and further comprising 0.010 to 1% Co and 0.0005 to 0.02% Mg, and the balance Fe with inevitable impurities, and in which the number of TiN based inclusions per unit area is≥1.0×10<SP>8</SP>(pieces/mm<SP>2</SP>). COPYRIGHT: (C)2007,JPO&INPIT
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