| 摘要 |
PURPOSE: A method for refining high-nickel alloy using AOD (argon oxygen decarburization) is provided to increase dephosphorization and desulphurization efficiencies and improve productivity by performing dephosphorization and desulphurization refining on the high-nickel alloy in AOD. CONSTITUTION: In a refining method of high-nickel alloy using AOD (argon oxygen decarburization) in which molten high-nickel alloy tapped from electric furnace is refined using AOD, the method for refining high-nickel alloy using AOD comprises a decarburization and dephosphorization step of decarburizing and dephosphorizing the molten high-nickel alloy so that basicity of the molten high-nickel alloy in AOD is 3 to 4, concentration of calcium oxide in slag is 40 to 45%, and concentration of iron oxide in slag is 23 to 32%; a slagging off step of recharging the slagged off molten high-nickel alloy into the AOD after tapping the molten high-nickel alloy decarburized and dephosphorized in the decarburization and dephosphorization step into a ladle and slagging off the molten high-nickel alloy tapped into the ladle; a molten high-nickel alloy temperature increasing step of increasing temperature of the molten high-nickel alloy recharged into the AOD after completing the slagging off step; and a desulphurization step of desulphurizing the molten high-nickel alloy whose temperature is increased in the molten high-nickel alloy temperature increasing step.
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