Flukskjerntetråd for gass-skjermet lysbuesveisising av stål med høy strekkstyrke

Gas-shielded-arc-welding flux cored wire contains carbon (in mass%) (0.04-0.11), silicon (0.4-0.75), manganese (1.3-2.5), nickel (0.1-2.5), chromium (0.1-1), molybdenum (0.1-1), titanium (0.06-0.3), iron (90 or more), nitrogen (0.015 or less), and remainder of unavoidable impurities. The content of carbon, silicon, manganese, nickel, chromium, molybdenum and titanium is represented by specific relation. Gas-shielded-arc-welding flux cored wire contains carbon (in mass%) (0.04-0.11), silicon (0.4-0.75), manganese (1.3-2.5), nickel (0.1-2.5), chromium (0.1-1), molybdenum (0.1-1), titanium (0.06-0.3), iron (90 or more), nitrogen (0.015 or less), and remainder of unavoidable impurities. The content of carbon (C), silicon (Si), manganese (Mn), nickel (Ni), chromium (Cr), molybdenum (Mo) and titanium (Ti) is represented by a relation: F(x)=-576.9[C]+34.1[Si]+80.1[Mn]+1.5[Ni]-22.8[Cr]-6.8[Mo]-83.1[Ti], which is 100 or more. The gas-shielded-arc-welding flux cored wire further contains alkali-metal fluoride, alkali-metal oxide, alkaline-earth-metal fluoride, alkaline-earth-metal oxide, boron, aluminum and magnesium.