ELIMINATING PROCESS FOR NONMETALLIC INCLUSIONS IN MOLTEN STEEL

摘要

PURPOSE:To eliminate nonmetallic inclusions in short time without temperature drop, and to cast clean molten steel into molds by means of pouring molten steel rotated by magnetic field in a vessel from the bottom of said vessel with the nonmetallic in clusions which have been floated up. CONSTITUTION:An electromagnetic rotation coil 2 is equipped on the outer side of a vessel, and by said magnetic field for rotation, molten steel is rotated around the central axis in a horizontal plane. A centripetal force acts on the nonmetallic inclusions 3 with small specific gravity on account of this centrifugal force, thereby gathering and floating the nonmetallic inclusions in the direction of the rotational axis upwardly. The nonmetallic inclusions contained in the molten steel which is remote from the rotational axis and is near the bottom of the vessel 1 are decreased, and then the molten steel is contenuously poured into molds 5 from a pouring port 4 equipped on the bottom of the vessel 1. By this process, the separation speed for the nonmetallic inclusions is increased and the clean molten steel can be obtained in short time. Further, the calorific loss taken away by gas-flowing may be neglected, and the temperature drop of the molten steel is prevented.