| 摘要 |
PURPOSE: A method for disposing of a bottom-blown nozzle of a complex blown-converter is provided to raise the stirring power by lowering the reduction of the efficiency of the kneading of a molten iron in an ingot steel caused by the clogging of a nozzle. CONSTITUTION: The bottom-blown nozzles(3,4,5,6,7,8) of the complex blown-converter(1)are positioned with the following steps. A 400 mm interval in both inner side and outer side of the nozzle is put toward the center thereof, while four ones of the nozzles are disposed in the same circumference corresponded to 0.41 times for inner size of the converter. Two ones thereof concerning an apex are disposed then therein in the diagonal direction of a parallelogram. Finally, six bottom-blown nozzles are disposed in the parallelogram state on the bottom of 150 tons or less of a low volume complex blown-converter. Thereby, it is possible to improve the stirring power in the converter to reduce total iron contents of the final sum of oxygen and slag, so as to induce the reduction of the amounts of the antioxidizing agent used therein and the improvements of the occurrence of the defectives in the ingot steel, whereby the reduction of the amounts of the deoxygenates results in the prevention from the contamination of the ingot steel.
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