| 摘要 |
PURPOSE: To prevent disconnection at the time of drawing and to improve the productivity of a small-diameter flux cored wire for welding austenitic stainless steels by specifying the average sectional area of austenitic crystal grains at the section in the thickness direction of a steel sheath after annealing to a specific size or below. CONSTITUTION: This flux cored wire for welding austenitic stainless steels is formed by cladding a filled flux 2 with the sheath 1 consisting of an austenitic stainless steel pipe or band. The flux cored wire formed by filling the flux 2 into the steel sheath 1 is subjected to drawing at <=70×10<-5> mm<2> in the average sectional area of the austenitic crystal grains at the section in the thickness direction of the steel sheath 1 after annealing in the intermediate stage of drawing. The sheath hardness is slightly high if the average sectional area of the austenite crystal grains of the microstructure of the sheath after annealing is <=70×10<-5> mm<2> and, therefore, the bite of the raw material particles into the inside wall of the sheath hardly arises at the time of subsequent drawing and even if the bite arises, the bite hardly progress to the disconnection.
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