Flux-cored wire for gas shield arc welding

A flux-cored wire configured for gas shielded arc welding, consisting of, based on a total wire mass:

• at least 78 mass % of Fe;
• from 4 mass % to 13 mass % of TiO2;
• from 1.7 mass % to 2.4 mass % of Mn;
• from 1.1 mass % to 3.0 mass % of Cr;
• from 0.2 mass % to 1.2 mass % of Mo;
• from 0.1 mass % to 0.8 mass % of Si;
• from 0.1 mass % to 1.0 mass % of Mg;
• from 0.05 mass % to 0.25 mass % of fluoride, based on a F conversion value;
• from 0.01 mass % to 0.10 mass % of C;
• from 0.003 mass % to 0.020 mass % of V;
• from 0.003 mass % to 0.020 mass % of Nb;
• and
• 8 ppm or less of B,
• optionally, from 0 mass % to 0.02 mass % of at least one selected from the group consisting of P, S, and N,
• optionally, from 0.01 mass % to 0.20 mass % of at least one selected from the group consisting of Na and K,
• with the balance being O and inevitable impurities, wherein O is derived from SiO2, Na2O, K2O, or a combination thereof,
• wherein the C is derived from a steel outer sheath of the flux-cored wire;
• a component contained in a flux of the flux-cored wire, the component being at least one selected from the group consisting of a graphite, chromium carbide, Si—C and an alloy of C;
• or both of the steel outer sheath and the component,
• wherein the contents of Mn, C, and V based on the total mass of the wire satisfy a relationship of 28×Mn/(390×C+2370×V)≥0.82, and
• wherein the contents of TiO2, Mg, Nb, and V, based on the total wire mass, satisfy the following relationship:
• 0.018×TiO2×Mg+2×(Nb+V)≤0.09.