METHOD FOR PRODUCING HIGH CLEANLINESS STEEL

PURPOSE:To easily produce a low Cr clean steel by blowing oxygen-containing gas into molten steel in a furnace and also suitably adjusting temp. of the molten steel and T-Fe content in molten slag at the time of producing the low Cr clean steel by using a furnace producing the Cr-containing steel. C...

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Bibliographische Detailangaben
Hauptverfasser:	MAKINO NOBUYUKI, YAMADA SUTEYOSHI, YOSHIKAWA TSUGIO, MATSUI IWAO, YANAGI KATSUSHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY METALLURGY OF IRON PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Beschreibung
Zusammenfassung:	PURPOSE:To easily produce a low Cr clean steel by blowing oxygen-containing gas into molten steel in a furnace and also suitably adjusting temp. of the molten steel and T-Fe content in molten slag at the time of producing the low Cr clean steel by using a furnace producing the Cr-containing steel. CONSTITUTION:By using the metal refining furnace contaminated with Cr caused by production of alloy steel containing much Cr content, steel scrap, etc., for raw material is melted and Fe2O3-containing raw material of scale, etc., is added and also, the pure oxygen gas or the oxygen-containing gas is blown into the molten steel for raw material. The Fe2O3 in the molten slag is made to strong oxidizing property of >=30% as the T-Fe and also, C, Si and Cr in the molten steel are refined to the oxidized-removal oxidizing force of the gaseous oxygen. The ratio (Cr)/[Cr] of the Cr content (Cr) as Cr2O3 in the molten slag to the Cr content [Cr] in the molten steel rapidly becomes large when the temp. of molten steel is