ULTRAHIGH-STRENGTH STEEL FOR WELDING STRUCTURE WITH EXCELLENT TOUGHNESS IN WELDING HEAT-AFFECTED ZONES THEREOF, AND METHOD FOR MANUFACTURING SAME

摘要

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