Mathematical Modeling on Slag Consumption and Lubrication in a Slab Continuous Casting Mold
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Mathematical Modeling on Slag Consumption and Lubrication in a Slab Continuous Casting Mold XUBIN ZHANG, ZENGKUN DAN, WEI CHEN, LIFENG ZHANG, and QIAN WANG In the current study, a two-dimensional mathematical model was applied to investigate the slag lubrication in continuous casting mold of slab through the acquisition of the average slag consumption per oscillation cycle and the shear stress acting on the shell. The thickness and the consumption of the slag in the shell/mold gap and the downward velocity on either side of the liquid slag were monitored at different distances below meniscus and compared with different casting parameters. With the increase of the distance below meniscus from 10 to 300 mm, the thickness of the total slag and the liquid slag decreased, and thickness was within 0.78 to 1.11 and 0.04 to 0.33 mm, respectively. The average slag consumption at four different locations below meniscus was approximate, within 0.0287 to 0.0298 kg/s in three adjacent oscillation cycles. With enough slag consumption, the shear stress was extremely small and was below 80 Pa at 100 and 300 mm below meniscus. With the decrease of the casting speed from 1.6 to 1.2 m/min, the casting superheat from 45 to 25 K and the oscillation frequency from 180 to 100 cpm, and the increase of the oscillation amplitude from 2 to 5 mm, the average slag consumption per ton of steel and the slag consumption (kg/m2) increased, and the consumption was within 0.0245 to 0.0415 kg/s and mainly below 0.40 kg/m2, respectively, which resulted in the improvement of the lubrication in the shell/mold gap. https://doi.org/10.1007/s11663-020-02022-4 Ó The Minerals, Metals & Materials Society and ASM International 2020
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INTRODUCTION
MOLD slag was firstly applied to continuous casting of steel in 1963.[1] During continuous casting of steel, the powder was continuously fed onto the top of the liquid steel in the mold, sintered to form the slag bed and then melted as the liquid slag pool.[2] The powder provided thermal insulation to prevent the meniscus from freezing, while the slag pool sealed off the liquid steel to avoid oxidation of the steel and absorbed floating non-metallic inclusions[3,4] from the liquid steel. With the oscillation of the mold and the downward movement of the solidified shell, the liquid slag in the slag pool gradually infiltrated into the shell/mold gap and existed
XUBIN ZHANG and QIAN WANG are with the College of Materials Science and Engineering, and Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials, Chongqing University, Chongqing 400044, China. Contact e-mail: [email protected] ZENGKUN DAN is with the School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China. WEI CHEN is with the School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing (USTB), Beijing 100083, China. LIFENG ZHANG is with the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China. Contact
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