| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux cored wire for gas shielded arc welding of a crude oil tank steel in which a weld zone exhibits excellent corrosion resistance in the crude oil corrosive environment of a crude oil tank transporting or storing crude oil.SOLUTION: A flux cored wire includes a value expressed in terms of TiOof 4.5 to 7.0%, a value expressed in terms of SiOof 0.2 to 0.7%, a value expressed in terms of ZrOof 0.1 to 0.7%, a value expressed in terms of AlOof 0.05 to 0.70%, one or two kinds selected from 0.03 to 0.09% C, 0.35 to 0.85% Si, 1.5 to 3.2% Mn, 0.03 to 0.40% Mo and 0.01 to 0.40% W, Cu of 0.03 to 0.70%, Al of 0.1 to 0.6%, Mg of 0.05 to 0.50%, the total of the value expressed in terms of NaO and the value expressed in terms of KO satisfying 0.05 to 0.20% and a value expressed in terms of F of 0.02 to 0.10%, by mass to the total mass of the wire. |
