METHOD FOR PREPARING TITANIUM-CONTAINING ULTRA-LOW-CARBON STEEL
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United States of America Patent
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Aug 29, 2024
app pub date -
Jun 28, 2022
filing date -
Jun 29, 2021
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Abstract
Disclosed is a method for preparing a titanium-containing ultra-low-carbon steel, comprising molten iron pretreatment, converter primary smelting, vacuum refining, continuous casting, hot rolling, pickling, and cold rolling. After vacuum refining decarbonization is finished, the content of free oxygen in molten steel is 100-350 ppm; after Al is then added for deoxidation treatment, the circulation time of the molten steel is greater than or equal to 3 min; after other alloys and rare earth elements are then added to the molten steel to adjust the components of the molten steel to the specifications of a finished product, the circulation time of the molten steel is greater than or equal to 2 min; and finally, an oxide Re2O3·Al2O3 is generated in the molten steel, and the vacuum refining is finished. The method can effectively improve the properties of a deoxidation inclusion in steel, solve the problem of smooth running of casting of the molten steel, reduce the incidence of cold rolling defects caused by Al2O3, and improve the product quality of the titanium-containing ultra-low-carbon steel.
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