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Steel plate having superior toughness in the of the welding heat affected zone and a method for their preparation; welded construction with the use thereof
Steel plate having superior toughness in the of the welding heat affected zone and a method for their preparation; welded construction with the use thereof
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机译：在焊接热影响区具有优异韧性的钢板及其制备方法;焊接结构及其使用
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摘要
Disclosed is a welding structural steel product exhibiting a superior heat affected zone toughness, comprising, in terms of percent by weight, 0.03 to 0.17% C, 0.01 to 0.5% Si, 0.4 to 2.0% Mn, 0.005 to 0.2% Ti, 0.0005 to 0.1% Al, 0.008 to 0.030% N, 0.0003 to 0.01%B, 0.001 to 0.2% W, at most 0.03% P, at most 0.03% S, at most 0.005% O, and balance Fe and incidental impurities while satisfying conditions of 1.2 ≤ Ti/N ≤ 2.5, 10 ≤ N/B ≤ 40, 2.5 ≤ A1/N ≤ 7, and 6.5 ≤ (Ti + 2A1 + 4B)/N ≤ 14, and having a microstructure essentially consisting of a complex structure of ferrite and pearlite having a grain size of 20 µm or less.
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