METHOD FOR HEATING MOLTEN STEEL

PROBLEM TO BE SOLVED: To provide a method for heating molten steel that can control the local flow of molten steel in a vacuum tank and can easily and stably suppress the formation of a lower oxide at the time of oxygen blowing.SOLUTION: There is provided a method for heating molten steel in which o...

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Hauptverfasser:	KASAHARA SHUHEI, KUSHIMOTO ATSUSHI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	CHEMISTRY METALLURGY METALLURGY OF IRON PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for heating molten steel that can control the local flow of molten steel in a vacuum tank and can easily and stably suppress the formation of a lower oxide at the time of oxygen blowing.SOLUTION: There is provided a method for heating molten steel in which oxygen is blown onto the surface of the molten steel from the top-blown lance set inside a vacuum chamber so as to react with Al in the molten steel in an RH vacuum degassing system. By controlling the relationship between the surface flow velocity of the molten steel in the vacuum chamber, the top-blown oxygen flow rate and the Al concentration in the molten steel after the oxygen blowing to predetermined conditions, local flow of the molten steel in the vacuum chamber is controlled.SELECTED DRAWING: Figure 1 【課題】真空槽内での局所的な溶鋼流動を制御し、酸素上吹き時の低級酸化物の生成を簡単かつ安定的に抑制可能な溶鋼の昇温方法を提供する。【解決手段】ＲＨ真空脱ガス装置にて、真空槽内部に設置された上吹きランスから溶鋼の表面に酸素を吹き付け、溶鋼中のＡｌと反応させて溶鋼を昇温する方法において、前記真空槽内の溶鋼の表面流速、上吹き酸素流量および酸素吹き付け後の溶鋼中Ａｌ濃度の関係を所定の条件とすることにより、真空槽内での局所的な溶鋼流動を制御する。【選択図】図１