| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel sheet pile in which problems of weld cracking and heat-affected zone(HAZ) hardening at the time of welding in a severe environment are solved and which has excellent underwater weldability. SOLUTION: This steel sheet pile has a composition consisting of, by mass, 0.005-0.030% C, <=1.0% Si, 0.6-2.0% Mn, <=0.1% Al, <=0.015% P, <=0.015% S, 0.010-0.1% Nb, 0.005-0.030% Ti, 0.0010-0.0040% B, and the balance Fe with inevitable impurities.
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