Flux cored wire for submerged arc welding of high intensity steel.

摘要

PROBLEM TO BE SOLVED: To provide a flux-cored wire for submerged arc welding for high strength steel, wherein for high speed submerged arc welding for high strength steel, an increase in the strength and toughness of a weld metal is made possible, and the weld metal having satisfactory wire productivity and bead shape and free from welding defects can be obtained.;SOLUTION: The flux-cored wire is characterized in that, the total of an outer skin made of steel and flux components contains, based on the total mass of the wire, 0.05 to 0.30% C, 0.1 to 0.5% Si, 1.0 to 3.0% Mn, 2.0 to 9.0% Ni, 1.5 to 3.5% Cr, 1.0 to 4.0% Mo, 0.02 to 0.10% Ti and 0.2 to 0.7% Mg, and the balance Fe with inevitable impurities, and the flux filling ratio in the wire components is 10 to 30 mass%, and the filled flux contains O of 0.2 to 1.0% based on the total mass of the flux, and further, the outer skin made of steel has no joints.;COPYRIGHT: (C)2008,JPO&INPIT