STEEL SHEET FOR WELDED STRUCTURE EXCELLENT IN TOUGHNESS OF EXTRA-LARGE HEAT INPUT WELDING HEAT-AFFECTED ZONE

摘要

PROBLEM TO BE SOLVED: To provide a steel sheet for extra-large heat input welding excellent in the toughness of the heat affected zone when a high efficiency welding method such as multielectrode submerged arc welding and electroslag welding is applied to steel used for building, shipbuilding, bridges, or the like. ;SOLUTION: This steel sheet for welded structures excellent in the toughness of the extra-large heat input welding heat-affected zone contains, by weight, 0.05 to 0.10% Al, 0.001 to 0.010% Ca, 0.005 to 0.015% Ti, ≤0.007% N and 0.002 to 0.006% O, not substantially containing, and the balance Fe with inevitable impurities.;COPYRIGHT: (C)2001,JPO