METHOD FOR REFINING HIGH ALUMINUM-CONTAINING STAINLESS STEEL

PROBLEM TO BE SOLVED: To provide a refining method of a high Al-containing stainless steel, by which the high Al-containing stainless steel containing 1-10 wt.% Al can be secondary-refined in safety and for a short time by using a refining vessel lined with an inexpensive MgO-containing refractory....

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Bibliographische Detailangaben
Hauptverfasser:	TAKEUCHI HIDEJI, HIROTA AKIHITO, OKUYAMA GORO
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 provide a refining method of a high Al-containing stainless steel, by which the high Al-containing stainless steel containing 1-10 wt.% Al can be secondary-refined in safety and for a short time by using a refining vessel lined with an inexpensive MgO-containing refractory. SOLUTION: In the case of desirably being CaO/Al2O3: 0.5-0.7 to the ratio of CaO concn. and Al2O3 concn. and MgO concn.: 0-5% wt.% in the slag composition after decarburizing treatment and before deoxidizing and reducing treatment in the secondary refining by using the refining vessel lined with the MgO- containing refractory, a prescribed quantity of Al is added. The slag composition when the prescribed quantity of Al is added, is desirable to be 0.5-0.7 CaO/Al2O3 the ratio of CaO concn. and Al2O3 concn. and 0-5 wt.% of MgO concn.