Effect of Calcium Treatment on Non-Metallic Inclusions in Ultra-Low Oxygen Steel Refined by High Basicity High Al2O3 Slag

Yang, Jun; Wang, Xinhua; Jiang, Min; Wang, Wanjun

doi:10.1016/s1006-706x(11)60083-6

Cited by 40 publications

(34 citation statements)

References 11 publications

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“…[34] (2) MgO and CaO in high-basicity slag could be simultaneously reduced by dissolved [Al] to supply dissolved [Mg] and [Ca] into the molten steel. [4,51,52] 3ðMgOÞ slag þ 2½Al ¼ ðAl 2 O 3 Þ slag þ 3½Mg: ½9…”

Section: Effect Of Slag Washing On Inclusion Controlmentioning

confidence: 99%

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Morphology Control for Al2O3 Inclusion Without Ca Treatment in High-Aluminum Steel

Chen

Guo

et al. 2015

Metall Mater Trans B

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Nozzle blockage is a major problem during continuous casting of Al-containing steel. Herein, we analyzed the thermodynamic equilibrium behavior between aluminum and oxygen in steel at 1873 K (1600°C) and demonstrated that, the dissolved [O] initially decreases with increasing the dissolved [Al] until approximately 0.1 wt pct [Al], and after that, the dissolved [O] increases with dissolved [Al]. Thus, for high-aluminum steel with 1.0 wt pct dissolved [Al], the precipitation of Al 2 O 3 inclusion can be avoided during cooling from deoxidation temperature to the liquidus temperature, if the actual dissolved [O] can be kept from increasing when the dissolved [Al] further increases from 0.1 to 1.0 wt pct. Hence, a method of inclusion control for highaluminum steel without traditional Ca treatment technology was proposed based on the thermodynamic analysis. Industrial tests confirmed that low-melting point Ca-aluminate inclusions were observed typically through a slag washing with SiO 2-minimized high-basicity slag during tapping, accompanied by two-step Al-adding process for production of high-aluminum steel. Moreover, there was no nozzle clogging occurred for five heats of continuous casting.

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Section: Effect Of Slag Washing On Inclusion Controlmentioning

confidence: 99%

“…However, the formed MA was not stable and could be changed to CaO-Al 2 O 3 -MgO when dissolved [Ca] entered the steel. [51,52] ðMgOÞ in MgOÀAl 2 O 3 þ ½Ca ¼ (CaO) in CaOÀAl 2 O 3 ÀMgO þ ½Mg:…”

Section: ½13mentioning

confidence: 99%

Morphology Control for Al2O3 Inclusion Without Ca Treatment in High-Aluminum Steel

Chen

Guo

et al. 2015

Metall Mater Trans B

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“…During BOF tapping and LF refining prophase, no alloys with Mg were added to the molten steel, MgO–Al 2 O 3 system inclusions are believed to be produced by the slag–metal interface reaction or the reaction between the firebrick lining and metal 10. MgO in LF refining top slag or in lining of firebrick could be reduced by [Al] during LF refining.…”

Section: Discussionmentioning

confidence: 99%

Experimental Study to Improve the Castability of Aluminum Killed Cold Heading Steel

Yang

Chen

Wei

et al. 2013

steel research int.

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Experimental study on the LF refining of aluminum killed cold heading steel shows that calcium content in the molten steel increased to about 0.0010% at the end of refining, and the aluminum deoxized products were transformed from Al 2 O 3 to the complex inclusions CaO-MgO-Al 2 O 3 with lower melting point by the high basicity, high Al 2 O 3 , and strong deoxidizing slag. The inclusions are in liquid state and can be easily floated up during LF refining and continuous casting. The total oxygen content of the steel falls to about 0.0020%. The experimental technology uses only 50 m calcium wire to the 80-t heat or even without calcium treatment. As compared to the traditional technology with higher amount of calcium for treatment, which forms CaS and CaO-MgO-Al 2 O 3 inclusions with high melting point, the experimental technology improves the castability and reduces the manufacturing cost.

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“…controlled, and also the development of the calciumtreatment is to reduce the negative effect of inclusions. 1,[13][14][15][16][17] But the content of oxygen and sulfur can not be reduced by calcium-treatment, and the inclusion morphology of MnS and AlN can not be well controlled. The rare earth treatment technology has been established to be one of the most promising methods for controlling inclusions, which will replace the calcium-treatment in the future.…”

Section: Effect Of Rare Earth Element La On Texture and Inclusion Of mentioning

confidence: 99%

Effect of Rare Earth Element La on Texture and Inclusion of Non-oriented Electrical Steel Produced by Thin Slab Casting and Rolling Process

Fan

Zhu

et al. 2018

ISIJ Int.

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Effect of Calcium Treatment on Non-Metallic Inclusions in Ultra-Low Oxygen Steel Refined by High Basicity High Al2O3 Slag

Cited by 40 publications

References 11 publications

Morphology Control for Al2O3 Inclusion Without Ca Treatment in High-Aluminum Steel

Morphology Control for Al2O3 Inclusion Without Ca Treatment in High-Aluminum Steel

Experimental Study to Improve the Castability of Aluminum Killed Cold Heading Steel

Effect of Rare Earth Element La on Texture and Inclusion of Non-oriented Electrical Steel Produced by Thin Slab Casting and Rolling Process

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