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US 4,362,556 AGranted
Arc furnace steelmaking involving oxygen blowing
AssigneeDaido Tokushuko Kabushiki Kaisha
InventorToshio Kishida
Life of this patent
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Abstract
In arc furnace steelmaking, oxygen gas is blown in the molten steel at melting period and/or oxidizing period so as to decrease the carbon content therein to 0.20% or less, preferably 0.15% or less, and subsequently, carbonaceous material is blown in the furnace by utilizing flow of a carrier gas. A higher melting yield and a smaller amount of slag production are achieved with an improved productivity and lower energy consumption.
Claims7
A method of steelmaking using an arc furnace characterized in that the method includes the steps of:
- (a) blowing oxygen into the furnace throughout a melting period and an oxidizing period in an amount of at least 10 Nm.sup.3 per charged ton calculated in terms of pure oxygen gas so as to decrease carbon content of a molten steel until it becomes 0.20% or less;
- and subsequently,
- (b) blowing a carbonaceous material having a carbon content of at least 60% by weight into the molten steel in the furnace by utilizing flow of a carrier gas.
Dependencies are inferred from the claim text.