| 摘要 |
PURPOSE: A method for deoxidizing molten steel in degassing process is provided to improve cleanliness of molten steel and reduce consumption of deoxidizer by properly setting injection quantity of deoxidizer containing aluminum according to blowing amount of oxygen for increasing temperature of molten steel in the degassing process. CONSTITUTION: In a degassing process comprising a process of blowing oxygen for increasing temperature of molten steel into molten steel, the method comprises a step of injecting 0.05 to 0.15 kg/molten steel-ton of deoxidizer containing 35 wt.% or more of aluminum into molten steel in the state that pressure recovering is completed after finishing the degassing process if blowing amount of the oxygen for increasing temperature of molten steel is 0.36 to 0.73 Nm¬3/molten steel-ton; a step of injecting 0.2 to 0.25 kg/molten steel-ton of deoxidizer containing 35 wt.% or more of aluminum into molten steel in the state that pressure recovering is completed after finishing the degassing process if blowing amount of the oxygen for increasing temperature of molten steel is 0.73 to 1.1 Nm¬3/molten steel-ton; and a step of injecting 0.26 to 0.35 kg/molten steel-ton of deoxidizer containing 35 wt.% or more of aluminum into molten steel in the state that pressure recovering is completed after finishing the degassing process if blowing amount of the oxygen for increasing temperature of molten steel is 1.1 Nm¬3/molten steel-ton or more.
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