Method for making steel in a liquid melt-fed electric furnace
AssigneePaul Wurth S.A.
InventorsAndré Kremer, Guy Denier, Jean-Luc Roth
Life of this patent
Estimating the term…
Abstract
A method for making steel in an electric furnace, wherein a predetermined amount of liquid melt is fed into the electric furnace. The method comprises the steps of (a) continuously feeding a controlled flow of liquid melt into the furnace without interrupting the heating from the electric arc, (b) continuously injecting a refining gas into the furnace before the C and/or Si content of the metal bath reaches a predetermined value, until the end of the feeding process, and (c) pursuing the injection of refining gas after the predetermined amount of melt has been fed into the furnace, until the target value for the C and/or Si content of the metal bath has been reached.
Claims20
Method of producing steel in an electric furnace, comprising the following steps:
- charging scrap into an electric furnace;
- melting the scrap by use of an electric arc;
- after a part of said scrap is molten, charging molten pig iron into the electric furnace continuously at a rate without interruption of heating by the electric arc providing a metal bath;
- and
- injecting refining gas into the furnace continuously at a rate during the charging of the pig iron,
- wherein the injection starts at a point when a quantity of pig iron is charged into the furnace and before a limit value of carbon and/or silicon concentration in the metal bath is reached, and ends with the end of charging is continued after charging with the planned quantity of pig iron until the target value of the concentration of carbon and/or silicon in the metal bath is reached.
Method of producing steel in an electric furnace, comprising the following steps:
- providing an electric furnace having an electrode for heating a metal bath with an electric arc and a feed opening relating to the electrode for injection of refining gas;
- charging scrap into the furnace;
- melting the scrap by use of the electric arc;
- after a part of said scrap is molten, charging molten pig iron into the electric furnace continuously at a controlled rate without interruption of the heating by the electric arc;
- and
- after a predetermined quantity of pig iron is charged into the furnace, continuously injecting refining gas at an adjustable rate into one of the two quadrants of the furnace which are both opposite to the feed opening, in such a way that a vertical plane containing the direction of injection substantially intersects a vertical plane containing the direction of charging.
Dependencies are inferred from the claim text.