| 摘要 |
In a flux-cored wire for welding an ultrahigh tensile strength steel, one or more of CaF 2 , BaF 2 , SrF 2 , and MgF 2 are included in the wire and, when a total amount thereof is defined as ±, the ± is more than 2.0% and equal to or less than 8.0% in terms of mass% with respect to a total mass of the wire, one or more of Ti oxide, Si oxide, Mg oxide, and Al oxide are included in the wire and, when a total amount thereof is defined as ², the ² is 0.01% to 1.20% in terms of mass% with respect to the total mass of the wire, a ratio of an amount of the CaF 2 with respect to the ± is 0.50 or more, a ratio of the ± with respect to the ² is 2.0 to 800.0, and Ceq defined in following Expression a is 0.60% to 1.20%, Ceq = C + Si / 24 + Mn / 6 + Ni / 40 + Cr / 5 + Mo / 4 + V / 14 |
