METHOD AND APPARATUS FOR PREVENTING THE INCLUSION OF SLAG INTO THE MOLTEN STEEL TAPPED FROM A CONVERTER

摘要

A method for preventing the inclusion of slag into the molten steel tapped from a tap hole of a converter comprising the following steps: pivotally suspending an elongated stopper as a pendulum from a supporting arm, immersing said stopper in the molten steel in said converter, lowering said stopper temporarily to close said tap hole when the depth of said molten steel has reached a predetermined level, lifting said stopper to a predetermined height above the inside opening of said tap hole in said converter, maintaining said stopper at said predetermined height above the inside opening of said tap hole irrespective of the tilting of said converter to thereby maintain a predetermined space between said stopper and the inside opening of said tap hole, flowing a constant flow-out of said molten steel into said tap hole through said predetermined space, preventing whirling of slag into the molten steel flow by maintaining said predetermined space, and lowering said stopper when the molten slag is about to flow out through said tap hole upon completion of the tapping of the molten steel to prevent said molten slag from flowing out of said tap hole. And an apparatus to carry out this method.