| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel material for a ship, which has such superior corrosion resistance as to be practically used even without being painted or electrically protected, and is superior in HAZ toughness in high-heat-input welding. SOLUTION: The steel material superior in corrosion resistance and HAZ toughness in high-heat-input welding for ship comprises 0.01-0.2% C, 0.01-0.5% Si, 0.01-2% Mn, 0.05-0.5% Al, 0.010-1.5% Cu, 0.010-1% Cr, 0.005-0.030% Ti, 0.003-0.015% N, further P and S restricted to 0.02% or less and 0.01% or less respectively, and the balance Fe with unavoidable impurities; and includes TiN-based inclusions in the number of 1.0×10<SP>8</SP>pieces per unit area (pieces per square millimeter) or more. COPYRIGHT: (C)2007,JPO&INPIT
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