Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Chitoshi Matsumura0
Chikashi Tada0
Date of Patent
March 8, 2011
0Patent Application Number
122236350
Date Filed
February 6, 2007
0Patent Primary Examiner
Patent abstract
Molten steel is refined in an electric furnace by using iron scrap as a main iron source, and is tapped into a separate refining vessel. Thereafter, metallic-Al containing material and CaO are added onto a bath surface of the molten steel, and an oxygen containing gas is supplied to the molten steel. Thereby, a nitrogen-removal reaction utilizing an AlN formation reaction is caused to proceed. Consequently, even in the case of molten steel having a low carbon content, a low-nitrogen steel can be refined and produced at low costs.
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