Heavy steel plate for high-heat energy input soldering with excellent shortness fissure spread stop character
A technology with stop characteristics and high heat energy, applied in the field of thick steel plates, can solve the problems of high heat energy input welding HAZ toughness improvement, not necessarily directly related, complicated process, etc., and achieve the effect of excellent brittle crack propagation stop characteristics and excellent HAZ toughness
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[0026] The inventors of the present invention attempted to achieve good HAZ toughness even under high heat energy input welding by miniaturizing Ti-based carbon and nitride. If the cooling rate at the time of solidification of molten steel is constant, the dispersion state of conventional Ti-based carbides and nitrides is considered to be determined only by the addition balance of Ti and N. However, as a result of intensive studies, the present inventors found that by narrowing the temperature range in the δ region shown in the state diagram of steel, Ti-based carbides and nitrides can be finely dispersed even with the same Ti and N additions.
[0027] The value of X defining the relationship of the above formula (2) is a function of the temperature range with respect to the delta domain. The present inventors tried to improve the toughness of the HAZ and discovered the relationship of the above-mentioned (2) formula, and the reason behind it will be explained first. The abov...
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