| 摘要 |
A high-strength steel plate characterized by comprising 0.01 to 0.15 wt.% carbon, 0.005 to 1.0 wt.% silicon, 0.1 to 2.2 wt.% manganese, 0.001 to 0.06 wt.% phosphorus, 0.001 to 0.01 wt.% sulfur, 0.0005 to 0.01 wt.% nitrogen, 0.001 to 0.10 wt.% aluminum, 0.005 to 0.05 wt.% niobium, 0.05 to 0.5 wt.% molybdenum, and iron as the main component, optionally containing 0.001 to 0.02 wt.% titanium, 0.2 to 2.0 wt.% copper, and 0.05 to 2.0 wt.% nickel, and satisfying the following relationship (A): 0.22 C(%) + (Si/30)(%) + (Mn/20)(%) + (Mo/15)(%). It is excellent in fatigue properties and moldability after welding, and can have a weld heat-affected zone which is less apt to have softened.
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