Method for adjusting composition of molten steel in arc process

摘要

Molten steel is refined in a converter and is poured from the converter to a ladle. A ferro-alloy containing a component to be adjusted is added to the molten steel as needed. An amount of the alloy to be added to the molten steel in the ladle is calculated from a composition analysis value of the molten steel in the converter, and the amount of the alloy which is added when the molten steel is poured from the converter. The thus calculated amount of the alloy is added to the molten steel in the ladle. Electrodes are submerged in a slag layer on the molten steel so as to be arranged a predetermined distance from the molten steel. Power is supplied to the electrodes so as to generate electric arcs between the electrodes and the molten steel, thereby, arc-heating the molten steel. Simultaneously, a lance is submerged in the molten steel, and an Ar gas is injected in the molten steel therethrough, thus strirring the molten steel. Since deoxidation and composition adjustment of the molten steel can be simultaneously performed, processing time can be shortened.