| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel sheet for shipbuilding in which the generation of blowholes and porosities which are the representative defects in laser welding and excellent in laser weldability in the case filler wire is not used in particular. SOLUTION: This steel sheet has a compsn. contg., by weight, 0.05 to 0.13% C, 0.1 to 0.5% Si, 0.5 to 1.7% Mn, <=0.02% P, <=0.01% S, 0.002 to 0.05% O, 0.005 to 0.1% Al and <=0.008% N, also satisfying the relationship of 0%+0.5×C%<=0.09%, and the balance Fe with inevitable impurities.
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