In the process of steelmaking, microalloying elements need to be added to control the oxygen content in steel or improve the properties of steel. Accurately calculating the distribution content of microalloying elements in continuous casting bloom was crucial. Considering the thermodynamic equilibrium content of elements in inclusions, a model for calculating the content distribution of elements in the bloom was established. After complete solidification, the sulfur content in inclusions was approximately 1.5 to 2 ppm, while the total sulfur (T.S) content in the center of the continuous casting bloom reached 80 ppm, which aligned with the detection results. After solidification, the aluminum (Al) content in inclusions was approximately 12 to 20 ppm, and the content of calcium (Ca) and magnesium (Mg) dissolved in steel was all lower than 0.01 ppm. In the center of the bloom, the total aluminum (T.Al) content was approximately 38 ppm, the total calcium (T.Ca) content was around 4.5 ppm, and the total magnesium (T.Mg) content was approximately 3.05 ppm. Mathematical analysis yielded macro segregation index (MI) value to characterize variations in elemental content (<InlineEquation ID="IEq100"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11663_2025_3658_Article_IEq100.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="306" /> </InlineMediaObject> <EquationSource Format="TEX">${MI}=(u-u_{s})\cdot\nabla(C_1)+(u-u_{s})\cdot\nabla(C_{\text{in}})$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mrow> <mi mathvariant="italic">MI</mi> </mrow> <mo>=</mo> <mrow> <mo stretchy="false">(</mo> <mi>u</mi> <mo>-</mo> <msub> <mi>u</mi> <mi>s</mi> </msub> <mo stretchy="false">)</mo> </mrow> <mo>·</mo> <mi mathvariant="normal">∇</mi> <mrow> <mo stretchy="false">(</mo> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo stretchy="false">)</mo> </mrow> <mo>+</mo> <mrow> <mo stretchy="false">(</mo> <mi>u</mi> <mo>-</mo> <msub> <mi>u</mi> <mi>s</mi> </msub> <mo stretchy="false">)</mo> </mrow> <mo>·</mo> <mi mathvariant="normal">∇</mi> <mrow> <mo stretchy="false">(</mo> <msub> <mi>C</mi> <mtext>in</mtext> </msub> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>), where MI values greater than 0 indicate a decrease in elemental content. A comparative analysis of MI values for S, Al, and Mg was conducted, showing perfect agreement with MI equation.

Prediction on the Total Microalloying Elements Content Within the Entire Continuous Casting Steel Bloom

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发表日期：

2025年6月27日

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Hao Yao,
Yuexin Zhang,
Chengjun Liu,
Lifeng Zhang,
Ying Ren,
Jumaev Akhmadjon Abduvokhidovich,
Deli Zhao,
Yahui Li

摘要

In the process of steelmaking, microalloying elements need to be added to control the oxygen content in steel or improve the properties of steel. Accurately calculating the distribution content of microalloying elements in continuous casting bloom was crucial. Considering the thermodynamic equilibrium content of elements in inclusions, a model for calculating the content distribution of elements in the bloom was established. After complete solidification, the sulfur content in inclusions was approximately 1.5 to 2 ppm, while the total sulfur (T.S) content in the center of the continuous casting bloom reached 80 ppm, which aligned with the detection results. After solidification, the aluminum (Al) content in inclusions was approximately 12 to 20 ppm, and the content of calcium (Ca) and magnesium (Mg) dissolved in steel was all lower than 0.01 ppm. In the center of the bloom, the total aluminum (T.Al) content was approximately 38 ppm, the total calcium (T.Ca) content was around 4.5 ppm, and the total magnesium (T.Mg) content was approximately 3.05 ppm. Mathematical analysis yielded macro segregation index (MI) value to characterize variations in elemental content ( ${MI}=(u-u_{s})\cdot\nabla(C_1)+(u-u_{s})\cdot\nabla(C_{\text{in}})$ $MI = (u - u_{s}) \cdot \nabla (C_{1}) + (u - u_{s}) \cdot \nabla (C_{in})$ ), where MI values greater than 0 indicate a decrease in elemental content. A comparative analysis of MI values for S, Al, and Mg was conducted, showing perfect agreement with MI equation.