Removal method of nitrogen in molten steel
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United States of America Patent
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Mar 8, 2011
Grant Date -
Jan 22, 2009
app pub date -
Feb 6, 2007
filing date -
Feb 9, 2006
priority date (Note) -
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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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