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US 4,010,026 AGranted
Arc furnace steelmaking
AssigneeBritish Steel Corporation
InventorDavid Engledow
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AssigneeBritish Steel Corporation
InventorDavid Engledow
Estimating the term…
This invention relates to a method of steelmaking in which a blend of particulate high carbon and low carbon iron-bearing material is continuously charged into an arc furnace at a rate dependent on the electrical and chemical energy reactions therein. The high carbon particulate material may be blast furnace iron in either granulated or `pigged` form; the low carbon material may be directly reduced iron pellets or fragmented scrap -- alternatively iron ore may be used. The steelmaking technique employed may be a batch process where a cycle is completed on tapping after continuous charging of the blend has been effected following melt-down of an initial scrap basket charge. Alternatively, a `hot heel` technique may be employed where a residue of molten metal is left in the furnace after tapping so that continuous charging commences immediately after each tapping sub-cycle. Typically three of five such sub-cycles may complete a main cycle.
A method of steelmaking in an electric arc furnace comprising the step of continuously charging a blend of particulate iron-bearing material to said furnace, said blend comprising a first particulate of low carbon iron-bearing material having a carbon content of less than about 0.8% and a second particulate of high carbon iron-bearing material having a carbon content greater than said first particulate and less than about 4%, the relative proportions of said first and second particulates comprising said blend and the rate of continuously charging said blend to said furance being controlled to:
A method of steelmaking in an electric arc furnace comprising the step of continuously charging a blend of particulate iron-bearing material to said furnace, said blend comprising a first particulate of low carbon iron-bearing material having a carbon content of less than about 0.8%, a second particulate of high carbon iron-bearing material having a carbon content greater than said first particulate and less than about 4%, and lime, the relative proportions of said first and second particulates comprising said blend and the rate of continuously charging said blend to said furnace being controlled to:
A method of steelmaking in an electric arc furnace, in which a blend of particulate high carbon and low carbon iron-bearing material is continuously charged into a furnace at a rate dependent on the electrical and chemical energy reactions therein, the continuous charging being effected after melt-down of an initial scrap basket charge, and in which a cycle is completed after a number of tappings concluding a like number of sub-cycles, continuous charging additionally being effected immediately after each said sub-cycle (except the last) on to a residue of molten metal left in the furnace after the previous tap.
Dependencies are inferred from the claim text.