| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a steel sheet pile having yield strength of 430-600 N/mm<SP POS="POST">2</SP>and good toughness. <P>SOLUTION: The steel sheet pile comprises a steel stock having yield strength of 430-600 N/mm<SP POS="POST">2</SP>and chemical composition containing, by mass: 0.04-0.19% of C, 0.01-0.60% of Si, 0.5-2.0% of Mn, 0.051-0.10% of Nb, 0.001-0.10% of sol. Al, and 0.0005-0.0090% of N, and at least one selected from 0.01-2.0% of Cu, 0.01-3.0% of Ni, 0.01-1.0% of Cr, 0.01-1.0% of Mo, 0.001-0.30% of V, 0.001-0.10% of Ti, and 0.0001-0.0050% of B; the remainder comprises Fe and impurities; and in terms of P, S, and O as impurities, P is 0.04% or less, S is 0.04% or less, and O is 0.005% or less. <P>COPYRIGHT: (C)2013,JPO&INPIT |
