| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux cored wire, wherein the segregation of component and unevenness of thickness at a skin part are eliminated as much as possible and excellent welding performance is obtained with a high efficient continuous manufacturing method to seam weld the juncture of belt steels by reviewing source powder of Si, Mn, and Ni, which the flux contains as an essential component at a large amount. SOLUTION: The flux composed of ferrous base Si-Mn alloy powder with a particle diameter of 212μm or the source powder with relative permeability of 1.10μor less, is fulfilled in the skin of the manufactured steel. The source powder comprises, at weight %, 0.40-1.20% C, 5-12% Si, 19-42% Mn, and the balance of Fe. Also, Si satisfies a formula (I): Si>=11.89-2.92C-0.077 Mn, or additionally satisfies a formula (II): Si>=8.3C+0.14 Mn.
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