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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：高热输入焊接用高强度钢板，在焊接热影响区具有优异的冲击韧性
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摘要
The present invention in weight%, C: 0.01 ~ 0.2%, Si: 0.1 ~ 0.5%, Mn: 1.0 ~ 3.0%, Ti: 0.01 ~ 0.1%, Ni: 0.5 ~ 3.0%, B: 0.0003-0.01%, Mo : characterized in that it comprises 0.03% or less, and other unavoidable impurities and the balance Fe: 0.05 ~ 1.0%, N: 0.004-0.008%, P: 0.030% or less, Al: 0.005-0.05%, S: 0.030% or less, O It provides a welding structural steel to. In addition, as needed, between the Ti, O, N, B, Mn and S, Ti / O: 1.3 ~ 3.0, Ti / N: 7 ~ 12, N / B: 0.8 ~ 1.5 and (Ti + 4B) / N: to satisfy the relation of 11 to 16, the microstructure acicular ferrite, and more than 85% in tissue fraction and TiO TiO- (Ti, B) N-MnS composite oxide is uniformly dispersed in the tissue at intervals of particle size less than 0.5㎛ 0.01 ~ 0.1㎛, number provides a welding structural steel that is welded at least 1.0x107 per 1mm 3 gae including the vagina. ; Welding structural steel as produced according to the present invention can have more excellent tensile strength, elongation and hardness properties and surface characteristics that a high utilization can be reliably used. ; Welded joints, complex oxide, acicular ferrite, submerged arc welding, SAW
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