| 主权项 |
1. A flux-cored wire comprising:
an outer steel sheath; and a flux with which the outer steel sheath is filled, wherein one or more of a fluoride of CaF2, BaF2, SrF2, MgF2, and LiF are included in the flux, when a total amount thereof is defined as α, the α is 3.3 to 6.0% in terms of mass % with respect to a total mass of the flux-cored wire, and a ratio of an amount of the CaF2 with respect to the α is 0.89 or more, one or more of a metal oxide of a Ti oxide, a Si oxide, a Zr oxide, a Mg oxide, and an Al oxide are included in the flux and, when a total amount thereof is defined as β, the β is 0.4 to 1.2% in terms of mass % with respect to the total mass of the flux-cored wire, one or more of a metal carbonate of CaCO3, BaCO3, SrCO3, MgCO3, and Li2CO3 are included in the flux and a total amount thereof is 0.1 to 0.5% in terms of mass % with respect to the total mass of the flux-cored wire, an amount of an iron powder in the flux is less than 10% in terms of mass % with respect to the total mass of the flux-cored wire, a chemical composition excluding the fluoride, the metal oxide, and the metal carbonate includes, in terms of mass % with respect to the total mass of the flux-cored wire, C: 0.04 to 0.09%; Si: 0.3 to 1.0%; Mn: 1.0 to 2.5%; Al: 0.001 to 0.050%; Ni: 1.5 to 3.5%; V: 0 to 0.04%; P: 0.02% or less; S: 0.02% or less; Cu: 0 to 0.5%; Cr: 0 to 0.5%; Mo: 0.3 to 1.0%; Ti: 0 to 0.30%; Nb: 0 to 0.10%; B: 0 to 0.0100%; Ca: 0 to 0.50%; REM: 0 to 0.0100%; and a remainder including Fe and an impurity, a Ceq defined by the below expression a is 0.60 to 0.75 mass %, a TE defined by the below expression b is 2.9 to 4.4 mass %,
Ceq=“C”+“Si”/24+“Mn”/6+“Ni”/40+“Cr”/5+“Mo”/4+“V”/14: Expression a,TE=“Mn”/2+“Ni”+3דCr”: Expression b, and elements to which double quote is attached express amounts of the elements in terms of mass %, respectively. |
