Speaker
Description
The background of this study is the expected increase in slag oxidation caused by the expansion of low HMR operation in the process of applying low-carbon steelmaking.
Ultra-low carbon steel is particularly used in products that require excellent formability, such as automotive exterior panels.
Ultra-low carbon steel is typically alloyed with Ti to form Ti(C,N). Therefore, the mechanism of formation in Ti-containing steel was investigated.
The study on the evolution of reoxidation products in Ti-added, Al-killed ultra-low carbon steel was performed using high-temperature confocal microscopy
and samples from an industrial plant, coupled with the thermo-chemical program FactSage.
The deoxidation product in ultra-low carbon steel was alumina. If the molten metal is exposed to air, however, complex oxides containing FetO-TiOx-Al2O3 inclusions form in ultra-low carbon steel.
The mechanism for the formation of reoxidation products in ultra-low carbon steel was suggested.
This finding provides grounds for preventing reoxidation, which causes nozzle clogging and surface defects in the steelmaking process.
| Speaker Country | Korea |
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