Patent ID: 8878099

Claim:
A flux cored wire for welding duplex stainless steel, comprising a steel sheath filled with a flux containing one or both of a metal oxide and metal fluoride for improving a slag envelopability or arc stability, designed to refine solidified grains, said flux cored wire containing, as chemical ingredients included in the steel sheath and the flux ingredients other than said one or both of the metal oxide and metal fluoride, by mass % with respect to the mass of the wire as a whole, C: 0.001 to 0.1%, Si: 0.01 to 1.0%, Mn: 2.0 to 6.0%, Cr: 17.0 to 27.0%, Ni: 1.0 to 10.0%, Mo: 0.1 to 3.0%, Al: 0.002 to 0.05%, Mg: 0.0005 to 0.01%, Ti: 0.0004/N (mass %) to 0.5%, N: 0.10 to 0.30%, furthermore restricting P to 0.03% or less and S to 0.01% or less, satisfying 0.73×Cr equivalents−Ni equivalents≧4.0 and having a balance of iron and unavoidable impurities, where Cr equivalents=Cr (mass %)+Mo (mass %)+1.5×Si (mass %), and Ni equivalents=Ni (mass %)+0.5×Mn (mass %)+30×C (mass %)+30×N (mass %); and wherein the flux cored wire has a completion of solidification in a single ferrite phase.