| 摘要 |
A ladle treatment method for reducing the absorption of oxygen and nitrogen is provided to improve cleanliness of stainless steel by minimizing mixing of oxygen and nitrogen with molten steel in a ladle when injecting a coolant and various ferroalloys into the molten steel during a stainless steel making process, thereby suppressing reoxidation. A ladle treatment method, wherein molten steel(M) is contained in a ladle(22) having a porous plug(23) at the bottom, and ferroalloys(F) stored in a hopper(3) are injected into the molten steel through upper, lower and intermediate supply pipes(502,503) from an upper part of the ladle, comprises the steps of: descending an end part of the lower supply pipe; injecting a first inert gas into the intermediate supply pipe; injecting a second inert gas into a start part of the lower supply pipe; providing a third inert gas that is ejected toward the end part of the lower supply pipe by ejecting the third inert gas onto the outer side of the lower supply pipe; and sequentially passing the ferroalloys through the upper, lower and intermediate supply pipes to inject the ferroalloys into the molten steel. |
