METHOD FOR PROTECTING IMMERSION TUBE FOR MOLTEN STAINLESS STEEL VACUUM REFINING FURNACE

PROBLEM TO BE SOLVED: To prevent the wearing of an immersion tube and the spalling breakage caused by the rapid temp. change from refining time to waiting time by adjusting the contained components in slag at the time of completing the refining under reduced pressure to specific ratio and coating th...

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Bibliographische Detailangaben
Hauptverfasser:	KATO KATSUHIKO, MIYAMOTO KENICHIRO, SHINKAI AKIO
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:	PROBLEM TO BE SOLVED: To prevent the wearing of an immersion tube and the spalling breakage caused by the rapid temp. change from refining time to waiting time by adjusting the contained components in slag at the time of completing the refining under reduced pressure to specific ratio and coating the adjusted slag on the surface of the immersion tube. SOLUTION: The composition of the slag coated on the surface of the immersion tube 17 is composed of, by wt.%, 55-90% total of Al2 O3 and CaO, 7-25% SiO2 , 1-10% Cr2 O3 and the balance 2-10% one or more kinds among FeO, Fe2 O3 and MgO. In this way, the erosion resistance of the coated layer is improved and the defective slagging and the defective coating on the immersion tube 17 caused by raising or m.p. of the slag, is restrained. Further, the effect of coating protection is improved while preventing the degradating collapse and the spalling caused phase transformation at the time of cooling the coated slag, is improved by regulating the ratio of Al2 O3 /CaO to 0.25-3.0.