2 electrode water flat fillet gas shielded arc welding powder-cored welding wires of crude oil tank steel

摘要

PROBLEM TO BE SOLVED: To provide a flux-cored wire for two-electrode horizontal fillet gas shield arc welding of a crude oil tank steel exerting excellent corrosion resistance and mechanical properties under corrosion environment of the crude oil tank due to the crude oil, and having favorable weld workability.SOLUTION: The steel outer skin of a flux-cored wire contains 0.02 mass% or less of C based on total mass of the steel outer skin, and the wire contains, in mass% based on total mass of the wire: one or two kinds of 0.03-0.10% C, 0.40-0.85% Si, 1.5-3.8% Mn, 0.03-0.40% Mo and 0.01-0.40% W; 0.03-1.00% Cu; 0.05-0.50% Al; 0.05-0.50% Mg; 2.5-4.5% TiOconversion value (hereafter referred to as c-value); 0.8-1.8% SiOc-value; 0.6-1.5% ZrOc-value; 0.05-1.0% FeO c-value; 0.05-0.50% AlOc-value; 0.05-0.20% sum of NaO and KO c-values; and 0.02-0.20% F c-value.SELECTED DRAWING: Figure 1