Thick steel plate having excellent toughness and reduced softening in weld heat-affected zone
A technology for welding heat-affected, thick steel plates, which is applied in the field of thick steel plates, can solve the problems of HAZ toughness reduction, no consideration, etc., and achieve excellent toughness, excellent mechanical properties, and the effect of inhibiting HAZ softening
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[0029] The inventors of the present invention conducted intensive research in order to provide a thick steel plate that has excellent HAZ toughness and suppressed HAZ softening even if a large heat input welding with a heat input exceeding about 60 kJ / mm is performed on a thick steel plate with a thickness of about 60 mm or more. . As a result, it was found that in order to coexist these characteristics, Ti, N, and B are used in the steel components, and the form of the old γ grains should be controlled to a flat shape as the pre-structure of the base material. In detail, it was found that: (a) Mainly, the miniaturization of austenite grains (γ grains) caused by TiN and the formation of intragranular ferrite with BN as the nucleus in TiN maximize To limit the enhancement of the HAZ toughness effect of the fine TiN; and (b) For N, excessive addition of Ti and B (in addition, Nb as needed) to ensure hardenability, and suppression of ferrite transformation to maximize Limit the softe...
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