METHOD FOR MELTING STAINLESS STEEL

PROBLEM TO BE SOLVED: To improve the service lives of furnaces and to reduce the cost of lining refractories, at the time of melting a stainless steel in blast furnaces, by alternately executing smelting reduction blowing and decarburization blowing in the same blast furnace. SOLUTION: A stainless s...

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Bibliographische Detailangaben
Hauptverfasser:	NOMURA HIROSHI, NABESHIMA SHIGEYUKI
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 MANUFACTURE OF IRON OR STEEL 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 improve the service lives of furnaces and to reduce the cost of lining refractories, at the time of melting a stainless steel in blast furnaces, by alternately executing smelting reduction blowing and decarburization blowing in the same blast furnace. SOLUTION: A stainless steel is melted by smelting reduction by ores contg. Cr or Cr and Ni or smelting reduction blowing of melting molten metal contg. Cr or Cr and Ni and decarburization blowing of decarburizing and smelting the molten metal. At this time, simultaneously working two blast furnaces are used, smelting reduction blowing and decarburization blowing are alternately executed per 1 to 10 charge in each blast furnace, and lining refractories are always coated with slag. In this way, the stainless steel can be melted at an inexpensive refractory cost, and the service lives of the furnaces can be improved.