ULTRAHIGH-STRENGTH WELDED STRUCTURAL STEEL HAVING EXCELLENT TOUGHNESS IN WELDING HEAT-AFFECTED ZONES THEREOF, AND PRODUCTION METHOD THEREFOR

摘要

The present invention relates to structural steel used in welded structures such as vessels, constructions, and bridges and, more specifically, to ultrahigh-strength welded structural steel, having excellent toughness in welding heat-affected zones thereof, and a method for producing same.