Abstract:Recent years, in order to use the properties of appropriate inclusions with specified composition and fine size for reducing inclusion harm as well as refining steel microstructures, [1][2][3][4][5] many researches have paid attention to technologies and mechanisms of complex deoxidization and inclusion treatments using Al, Ti, and Mg. [5][6][7][8][9][10] Zheng et al. [4] observed single Al 2 O 3 , MnS, and TiN inclusions in the Al-Ti complex deoxidized low-carbon steel and single MnS and TiO x -MnS complex in… Show more
“…[ 48 ] The sulfur content in the steel liquid first increases, which may promote the formation of Al–Mg–O‐wrapped Mn(Ca)S and the precipitation of MnS inclusions in the steel. [ 49 ] The sulfur content in the steel liquid gradually increases, which may be conducive to Al–Mg–O–wrapped CaS inclusions in the steel.…”
It is crucial for recycling scrap steel to effectively remove impurities such as sulfur and oxygen, which directly determine the characteristics of inclusions in steel liquid. This study attempts to investigate the effect of Al concentration on the cleanliness of x% Al–7CrSiMnMoV steel by directly smelting scrap steel. Impurities such as sulfur and oxygen, as well as alloying elements in steel, are investigated. Also, the evolution characteristics of inclusion in the x% Al–7CrSiMnMoV steel are evaluated. The results show that the oxygen concentration in steel liquid gradually decreases; however, the sulfur concentration in steel liquid first increases and then decreases as the aluminum concentration increases from 0.026% to 0.58%. A high‐cleanliness 0.58% Al–7CrSiMnMoV steel with sulfur and oxygen concentrations of 0.0015% and 0.0018%, respectively, can be obtained. Additionally, the high Al–Ca–Mg–O and high Ca–Al–Mg–O contain S composite inclusions, and a small amount of fine Mn(Ca)S inclusions first form the high‐Al–Ca–Mg–O composite inclusions with an aluminum concentration of 0.026%, then form the high‐Al–Mg–O, Al–Mg–O‐wrapped Mn(Ca)S, and a large number of fine MnS inclusions with an aluminum concentration of 0.11%; eventually, it forms Al–Mg–O‐wrapped CaS as the Al concentrations continuously increase.
“…[ 48 ] The sulfur content in the steel liquid first increases, which may promote the formation of Al–Mg–O‐wrapped Mn(Ca)S and the precipitation of MnS inclusions in the steel. [ 49 ] The sulfur content in the steel liquid gradually increases, which may be conducive to Al–Mg–O–wrapped CaS inclusions in the steel.…”
It is crucial for recycling scrap steel to effectively remove impurities such as sulfur and oxygen, which directly determine the characteristics of inclusions in steel liquid. This study attempts to investigate the effect of Al concentration on the cleanliness of x% Al–7CrSiMnMoV steel by directly smelting scrap steel. Impurities such as sulfur and oxygen, as well as alloying elements in steel, are investigated. Also, the evolution characteristics of inclusion in the x% Al–7CrSiMnMoV steel are evaluated. The results show that the oxygen concentration in steel liquid gradually decreases; however, the sulfur concentration in steel liquid first increases and then decreases as the aluminum concentration increases from 0.026% to 0.58%. A high‐cleanliness 0.58% Al–7CrSiMnMoV steel with sulfur and oxygen concentrations of 0.0015% and 0.0018%, respectively, can be obtained. Additionally, the high Al–Ca–Mg–O and high Ca–Al–Mg–O contain S composite inclusions, and a small amount of fine Mn(Ca)S inclusions first form the high‐Al–Ca–Mg–O composite inclusions with an aluminum concentration of 0.026%, then form the high‐Al–Mg–O, Al–Mg–O‐wrapped Mn(Ca)S, and a large number of fine MnS inclusions with an aluminum concentration of 0.11%; eventually, it forms Al–Mg–O‐wrapped CaS as the Al concentrations continuously increase.
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