| 摘要 |
The present invention relates to a method for refining molten steel so that the prime cost of alloy steel, which is injected in the event of the tapping work of revolving furnace refining works, becomes minimized. The method for refining molten steel according to one embodiment of the present invention, as a method for refining molten steel controlling the component of molten steel by injecting alloy steel into the molten steel tapped from a revolving furnace, includes the following steps of: setting the desired value of the component required to be controlled according to the component range of steel grade; calculating the amount of molten steel tapped from the revolving furnace according to the amount of molten iron inserted into the revolving furnace; determining the type of alloy steel and the amount of the alloy steel so as to produce the alloy steel at the lowest cost among alloy steel including components required for the control; weighting the alloy steel according to the type and injected amount of the determined alloy steel; tapping the molten steel to a receiving ladle; and injecting the weighted alloy steel while the molten steel is tapped. [Reference numerals] (AA) Refine an electric circuit;(BB) Calculate tapping amount;(CC) Set a target value for each component;(DD) Select the kind of alloy iron and an input amount for calculating the lowest production cost;(EE) Weigh alloy steel;(FF) Estimate tapping time;(GG) Regular position of a receiving ladle;(HH) Input a recarburizer;(II) Start tapping;(JJ) Bottom bubbling;(KK) Input alloy steel at the time of tapping 2/5-3/5;(LL) Complete tapping |
