Influence of Silicon on Desulfurization of Al-Killed Steel by CaO-Al<sub>2</sub>O<sub>3</sub>Slag Contained FeO and MnO

Xu, Jianfei; Huang, Fuxiang; Wang, Xinhua; Jing, C. L.

doi:10.1002/srin.201600053

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…However, (FeO + MnO) content can be also controlled in the range from 0.5 to 1% for heats 3–4 without LF refining when silicon content in steel is high, which has been clarified in the previous study. 10 Thus, the influence of (FeO + MnO) content in slag on T.O content is negligible in this study.…”

Section: Resultsmentioning

confidence: 68%

Investigation on the removal efficiency of inclusions in Al-killed liquid steel in different refining processes

Huang

Wang

et al. 2016

Ironmaking & Steelmaking

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Industry trials were carried out to study the removal efficiency of inclusions in Al-killed liquid steel in the processes of BOF-LF-RH-CC and BOF-RH-CC. It was found that the removal efficiency of inclusions has a high dependence on inclusion types. Solid inclusions are more easily to be removed than liquid inclusions. The removal efficiency of solid Al 2 O 3 inclusions is higher than that of solid CaO-Al 2 O 3 -MgO inclusions. As liquid CaO-Al 2 O 3 -MgO inclusions coexisted with solid CaO-Al 2 O 3 -MgO inclusions in the liquid steel, the low removal efficiency of inclusions in RH degassing process was found in BOF-LF-RH-CC process. However, high removal efficiency and ultra-low total oxygen (T.O) content were obtained in BOF-RH-CC process because the inclusions were mainly composed of solid Al 2 O 3 although initial T.O content before RH degassing was relatively high. This is due to the fact that solid Al 2 O 3 tends to form clustershaped inclusions which have both a higher contact angle and a lower work of adhesion with steel than calcium aluminate, resulting in easier removal by RH degassing. Therefore, it is proposed to weaken steel-slag reaction and calcium treatment before RH degassing to retain solid Al 2 O 3 inclusions in the steel.

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Section: Resultsmentioning

confidence: 68%

Investigation on the removal efficiency of inclusions in Al-killed liquid steel in different refining processes

Huang

Wang

et al. 2016

Ironmaking & Steelmaking

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“…increases non-linearly with basicity, from 0.84 to 6.45, as Figure 8A shown. Xu et al (2016) conducted slag-washing trials in LD tapping process to study the effects of silicon on the desulfurization of Al-killed steel using CaO-Al 2 O 3 slag which contained FeO and MnO. Measured oxygen activity at slag-steel reaction is reduced more sharply by increasing the silicon content than that by increasing the aluminum content.…”

Section: Resultsmentioning

confidence: 99%

Investigation of deoxidation of high-silicon austenitic sulfuric acid-resistant stainless steel

Dou

Guo

et al. 2022

Front. Mater.

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The oxygen content in high-silicon austenitic sulfuric acid-resistant stainless steels is one of the most detrimental parameters to their corrosion resistance. Based on the ion-molecular coexistence theory (IMCT), a thermodynamic model of the slag-steel reaction of austenitic stainless steel containing 5.0 wt% Si with CaF2-CaO-Al2O3-MgO-SiO2 pentabasic slag was developed to investigate the deoxidation reaction and the oxygen control mechanism of the steel. The model was validated through experiments proposed in this study. The results of the slag-steel reaction indicated that the equilibrium oxygen content was determined by the greater of two factors: w[O]%, Si obtained from the [Si]-[O] equilibrium reaction controlled by the activity of SiO2 and w[O]%, Al obtained from the [Al]-[O] equilibrium reaction controlled by the activity of Al2O3. The system temperature and the basicity of slag are the most crucial among the multiple variables affecting the equilibrium oxygen content compared with Al2O3 and CaF2 in slag. However, achieving an ultra-low oxygen steel, both a basicity of slag greater than two and a low activity of Al2O3 in slag should be maintained. The total oxygen content in steel can reach a minimum value of 3.4 ppm when the slag composition encompasses w(CaF2)% = 29.38, w(CaO)% = 44.07, w(SiO2)% = 14.69, w(MgO)% = 9.89, w(Al2O3)% = 1.96. The high basicity of slag reduces the total oxygen content of stainless steel, whereas the influence of redox reactions between Si and Al results in a higher Al content in steel and the formation of more inclusions during solidification. Thus, the optimal Al2O3 content is less than 4% and the optimal basicity is 2.4 during the refining process.

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“…[17,18] The addition of deoxidizers such as Mn, Si, and Al can affect the desulfurization, which largely determines the inclusion characteristic in the steel. Xu et al [19,20] found that silicon in steel liquid can change the composition of the slag to improve the desulfurization ability. Moreover, deoxidizers such as Al, Si, and Mn may also affect the composition of the steel liquid due to interface reactions between slag and steel.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al on the Cleanliness of the x% Al–7CrSiMnMoV Steel Produced by Scrap Steel

Long,

Zeng,

Gao

et al. 2024

steel research int.

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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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Influence of Silicon on Desulfurization of Al-Killed Steel by CaO-Al₂O₃Slag Contained FeO and MnO

Cited by 6 publications

References 15 publications

Investigation on the removal efficiency of inclusions in Al-killed liquid steel in different refining processes

Investigation on the removal efficiency of inclusions in Al-killed liquid steel in different refining processes

Investigation of deoxidation of high-silicon austenitic sulfuric acid-resistant stainless steel

Effect of Al on the Cleanliness of the x% Al–7CrSiMnMoV Steel Produced by Scrap Steel

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Influence of Silicon on Desulfurization of Al-Killed Steel by CaO-Al2O3Slag Contained FeO and MnO

Cited by 6 publications

References 15 publications

Investigation on the removal efficiency of inclusions in Al-killed liquid steel in different refining processes

Investigation on the removal efficiency of inclusions in Al-killed liquid steel in different refining processes

Investigation of deoxidation of high-silicon austenitic sulfuric acid-resistant stainless steel

Effect of Al on the Cleanliness of the x% Al–7CrSiMnMoV Steel Produced by Scrap Steel

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Influence of Silicon on Desulfurization of Al-Killed Steel by CaO-Al₂O₃Slag Contained FeO and MnO