WELDED METAL AND WELDED STRUCTURE PROVIDED WITH SAME

摘要

This welded metal contains 0.02 - 0.10% of C, 0.10 - 0.60% of Si, 0.90 - 2.5% of Mn, 0.20 - 2.00% of Ni, 0.05 - 1.0% of Cr, 0.10 - 1.50% of Mo, 0.040 - 0.15% of Ti, 0.0010 - 0.0050% of B, 0.030 - 0.100% of 0 and 0.015% or less (excluding 0%) of N, with the balance made up of iron and unavoidable impurities. The average circle-equivalent diameter of carbides having a circle-equivalent diameter of 0.40 µm or more among the carbides present in the grain boundary of this welded metal is 0.75 µm or less. Consequently, the present invention provides: a welded metal which exhibits excellent low-temperature toughness at lower temperatures, while having high strength after SR annealing, even in cases where gas sealed arc welding using a flux cored wire and having excellent work efficiency is applied; and a welded structure which is provided with this welded metal.