MOLD FLUX FOR CONTINUOUS CASTING OF HIGH ALUMINUM STEEL AND METHOD OF MANUFACTURING CAST SLAB

PROBLEM TO BE SOLVED: To stably carry out casting when continuously casting high aluminum steel with a sol.Al concentration of ≥0.1 mass% and to sufficiently remove scales immediately after hot rough rolling. SOLUTION: Mold flux is used for continuous casting of ordinary steel having the sol.Al conc...

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Hauptverfasser:	KAWAMOTO MASAYUKI, FUJINAKA SHINGO, MIZUNO YASUHIRO, HANAO MASAHITO, TSUKAGUCHI YUICHI, OTA KOZO, OKADA HIKARI
Format:	Patent
Sprache:	eng
Schlagworte:	CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES 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 PERFORMING OPERATIONS POWDER METALLURGY 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 TRANSPORTING TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Zusammenfassung:	PROBLEM TO BE SOLVED: To stably carry out casting when continuously casting high aluminum steel with a sol.Al concentration of ≥0.1 mass% and to sufficiently remove scales immediately after hot rough rolling. SOLUTION: Mold flux is used for continuous casting of ordinary steel having the sol.Al concentration of 0.1-1.5 mass%, a Si concentration of 0.3-2.0 mass%, and a C concentration of 0.05-0.18 mass%. The mold flux has a ratio (CaO/SiO2) of 1.0-2.0 obtained by dividing a CaO content by a SiO2content, contains one or two kinds of 1.0-8.0 mass% of P2O5and 0.5-5.0 mass% of B2O3, has a solidification temperature of 1,050-1,200°C and a viscosity of 0.5-2.5 dPa s at 1,300°C, and has cuspidine as a main crystal phase in a sample at a normal temperature where once-melted flux is cooled at a temperature-falling rate of 10°C per min. When the high aluminum steel with the sol. Al concentration of ≥0.1 mass% is continuously cast, scale removal by high pressure water or the like is accelerated, and hot rolled steel sheet having reduced insular scales is obtained. COPYRIGHT: (C)2010,JPO&INPIT