Kinetic Study of Interaction Between Aluminum Deoxidized Steel and CaO-MgO-Al2O3 Refining Slag
Received date: 2024-01-17
Revised date: 2024-07-18
Online published: 2024-08-16
Supported by
National Key Research and Development Program of China(2023YFB3709900);National Nature Science Foundation of China(U22A20171);Hesteel Group Key Science and Technology Projects(HG-2022103)
This research introduces a coupled dynamic model, which involves refining slag, molten steel, inclusions, and refractory materials, to explore the modification effects of CaO-MgO-Al2O3 refining slag on Al2O3 inclusions within steel. The study examines the impact of varying aluminum contents in steel and CaO / Al2O3 ratios in slag on inclusion modification. Notably, the Ca content in both steel and inclusions exhibits a positive correlation with the Al content in steel and the CaO / Al2O3 ratio in the slag. An increase in the Al content in steel from 0.01% to 0.75% led to a rise in the Ca content in the molten steel from 0.07 × 10-6 to 1.47 × 10-6, accompanied by an increase in the CaO content in inclusions from 0.44% to 7.89%. Additionally, elevating the CaO / Al2O3 ratio in the slag from 1.0 to 2.2 enhanced the Ca content in the molten steel from 0.15 × 10-6 to 0.50 × 10-6 and increased the CaO content in inclusions from 0.88% to 2.95%. When the Al content in the steel reached 0.8% and the CaO / Al2O3 ratio in the slag stood at 2.2, the total Ca content in the steel escalated to 2.52 × 10-6, while the CaO content in inclusions surged to 10.96%. These results affirm that CaO-MgO-Al2O3 refining slag is capable of effectively transforming Al2O3 inclusions into CaO-Al2O3 inclusions, with the modification extent predominantly influenced by the Al content in the steel.
Key words： slag-steel reaction; aluminum-killed steel; inclusion; kinetic model
WANG Bochen , REN Ying , KUANG Shuang , SHAN Qinglin , PAN Hongwei , LU Boxun , SHI Xiaowei , WANG Jujin , ZHANG Lifeng . Kinetic Study of Interaction Between Aluminum Deoxidized Steel and CaO-MgO-Al2O3 Refining Slag[J]. Acta Metall Sin, 2025 , 61(9) : 1335 -1343 . DOI: 10.11900/0412.1961.2024.00012
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