| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a steel manufacturing process using preheated scrap, which controls the fluctuation of heat balance in a smelting furnace, by controlling the fluctuation of a temperature of and reducing an oxidized amount of the preheated scrap. <P>SOLUTION: The steel manufacturing process comprises the steps of; preheating the scrap containing iron; charging a raw steel material containing the preheated scrap and molten pig iron into the smelting furnace; and supplying an oxygen-containing gas into the smelting furnace to smelt the molten steel. The steel manufacturing process also comprises the steps of: using a scrap which has been worked so as to reduce its specific surface area, as a scrap to be preheated; calculating the heat balance between amounts of input heat and output heat from and to the smelting furnace on the basis of a pre-calculated target temperature of the molten steel; and adjusting the amounts of input heat and output heat from and to the smelting furnace so that they can be equal to each other, by adjusting at least any one of a blending ratio of the preheated scrap, a preheating temperature of the preheated scrap and a charge amount of an external coolant. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
