PRODUCTION OF CLEAN STEEL

PURPOSE:To reduce the inclusions in molten steel down to desired amts. by stirring the molten steel added with desired alloy elements under vacuum degassing treatment for the time expressed by the specific equation and at prescribed degrees of vacuum. CONSTITUTION:Desired alloy elements are added in...

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Bibliographische Detailangaben
Hauptverfasser:	KATSUYAMA NORIO, WAKITA JIYUNICHI, KOMAI TADANOBU, YOSHIDA MOTOKI
Format:	Patent
Sprache:	eng
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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Beschreibung
Zusammenfassung:	PURPOSE:To reduce the inclusions in molten steel down to desired amts. by stirring the molten steel added with desired alloy elements under vacuum degassing treatment for the time expressed by the specific equation and at prescribed degrees of vacuum. CONSTITUTION:Desired alloy elements are added in the form of, for example, Fe- Si, Fe-Mn, Al, to molten steel. Next, the molten steel added with the alloy elements is put into a ladle, and this ladle is moved to a vacuum degassing treatment position. Thence, in a vacuum degassing vessel, it is kept at 10-30mm.Hg degrees of vacuum and the molten steel is stirred and oscillated for the time t1 minute expressed by the equation. By the above-mentioned method, the inclusions in the molten steel are reduced down to desired amts., and the molten steel of high clean liness is obtained.