Key technologies of efficient deep decarburization and synergistic deoxidation during RH refining

Focusing on the objective of efficient deep decarburization and synergistic deoxidation for IF steel production during RH refining, the feasibility and strategies of RH decarburization and synergistic deoxidation are analyzed based on the carbon-oxygen thermodynamics during RH refining. The efficient decarburization strategies at different decarburization stages are determined according to the kinetics of decarburization reaction. The synergistic technologies of efficient decarburization and oxygen control, such as RH forced decarburization, and oxygen blowing flow rate and lance position control are analyzed. Meanwhile, the key technologies of RH efficient decarburization, such as vacuum pressure drop control, circulation flow rate optimization, and enhanced decarburization by argon blowing inside the vacuum chamber, and the key technologies of oxygen control, such as oxygen content control at the end of RH decarburization, and top slag oxidability control are researched. A synergistic strategy of efficient deep decarburization and deoxidation during RH refining through the integrated application of the above technologies is further proposed.