| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength steel sheet which has a tensile strength of≥1,180 MPa and excellent delayed fracture resistance, and to provide its production method. SOLUTION: The high strength steel sheet having excellent delayed fracture resistance contains, by mass, 0.05 to 0.3% C, <3.0% Si, 0.5 to 3.0% Mn, 0.1 to 3.0% Mo, 0.02 to 0.5% V,≤0.02% P and≤0.02% S, also satisfying 1≤(Mo/V), and if required, one or more kinds of metals selected from 0.05 to 3.0% Cr, 0.05 to 5.0% Ni, 0.05 to 2.0% Cu, 0.05 to 3.0% W, 0.005 to 0.1% Al, 0.005 to 0.3% Ti, 0.005 to 0.3% Nb, 0.0003 to 0.05% B and 0.001 to 0.05% N, and the balance Fe with inevitable impurities. COPYRIGHT: (C)2005,JPO&NCIPI
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