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HIGH STRENGTH STEEL PLATE FOR HIGH HEAT INPUT WELDING HAVING WELDED JOINT WITH SUPERIOR IMPACT TOUGHNESS IN WELD HEAT AFFECTED ZONE
HIGH STRENGTH STEEL PLATE FOR HIGH HEAT INPUT WELDING HAVING WELDED JOINT WITH SUPERIOR IMPACT TOUGHNESS IN WELD HEAT AFFECTED ZONE
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机译：焊接热影响区中具有超强冲击韧性的焊接接头的高强度焊接用高强度钢板
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摘要
There is provided welding structural steel, including, by weight, 0.01 to 0.2% C, 0.1 to 0.5% Si, 1.0 to 3.0% Mn, 0.01 to 0.1% Ti, 0.5 to 3.0% Ni, 0.0003 to 0.01% B, 0.05 to 1.0% Mo, 0.004 to 0.008% N, at most 0.030% P, 0.005 to 0.05% Al, at most 0.030% S, 0.01 to 0.03% O, and the balance of Fe and unavoidable impurities. The Ti, O, N, B, Mn and S satisfy relations of 1.3≤Ti/O≤3.0, 7≤Ti/N≤12,0.8≤N/B1.5, and 11≤(Ti+4B)/N≤16. A fine structure of a welded joint of the steel includes acicular ferrite of 85%, TiO and TiO-(Ti5B)N-MnS composite oxides are dispersed uniformly in the structure at a spacing of 0.5μm or shorter, and have a grain size ranging from 0.01 to 0.1μm. The number of TiO and TiO-(Ti5B)N-MnS composite oxides in the welded joint is 1.0x107/mm3 or more. The welding structural steel ensures high utility and stable use thereof because of its excellent tensile strength, elongation, hardness properties and surface properties.
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