Patent ID: 6235084
Filing Date: 2001-05-22
Classification: C21C

Abstract:
A process for decarburizing a steel melt in a closed metallurgical vessel that is connected to a vacuum unit, comprising the steps of:filling the closed metallurgical vessel with a steel melt comprising carbon;adjusting the pressure in the closed metallurgical vessel to below 100 mbar;introducing a replenishment supply of oxygen to the closed metallurgical vessel to implement decarburization of the steel melt to remove the carbon;introducing a metallic combustible, substance at an even introduction rate to the closed metallurgical vessel after said step of introducing a replenishment supply of oxygen; andintroducing an additional amount of oxygen during said step of introducing a metallic combustible substance needed to combust the metallic combustible substance during the decarburization of the steel melt, wherein said steps of introducing a metallic combustible substance and introducing an additional amount of oxygen are performed during the first 10 minutes following completion of said step of adjusting the pressure.