Evaluation of Solidified Shell Thickness by Thermocouple in Mold

Ito, Yoichi M.; Nabeshima, Seiji; Miki, Yuji; Kubota, Jun; Matsuoka, Katsuaki

doi:10.2355/isijinternational.isijint-2019-221

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…The white band can be formed at the solidified shell-liquid interface continuously at off-corner in the cross section perpendicular to the casting direction due to the discharge flow from the submerged entry nozzle and reverse flow on the narrow side mould. Although heat flux in the mould and mould temperature can be measured by installing the thermocouples in the mould [35], it is difficult for continuous measurement and continuous evaluation of shell thickness behaviour along width direction at off-corner because each thermocouple can not be installed continuously along width direction in the mould. Therefore, in this study, the observation of the white band in the slab samples was adopted as a method for evaluation of and .…”

Section: Experimental Methodsmentioning

confidence: 99%

Influence of heat flux different between wide and narrow face in continuous casting mould on unevenness of hypo-peritectic steel solidification at off-corner

Furumai

Aramaki

Oikawa

2022

Ironmaking & Steelmaking

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The effects of the difference of the heat flux between the wide face and narrow face of the mould, the mould taper, casting speed and cooling rate on unevenness of hypo-peritectic steel at the off-corner in the mould, which leads to longitudinal cracking, bleeding and breakout during continuous casting, were evaluated by a finite element model (FEM) simulation and a plant test with a commercial continuous caster. The simulation results show that an increase in the difference in the heat flux between the wide and narrow face increases the off-corner unevenness of solidification because the solidified shell on the low heat flux side is pulled toward the high heat flux side. The analysis results were in good agreement with the plant test results. These results revealed the importance of optimizing the heat flux ratio between the wide face and narrow face mould even under a high casting speed condition.

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Section: Experimental Methodsmentioning

confidence: 99%

Influence of heat flux different between wide and narrow face in continuous casting mould on unevenness of hypo-peritectic steel solidification at off-corner

Furumai

Aramaki

Oikawa

2022

Ironmaking & Steelmaking

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“…The results indicated that the shell growth is not a typical parabolic shape and depended on the impinging of molten steel jet. Ito et al 13) developed a real-time calculation of the solidified shell thickness by thermocouple, and found that the shell would be re-melting under the condition of high speed casting and narrow width slabs. Xu et al 14) studied the transport phenomenon in a beam-blank mold by physical and numerical simulation, and it was pointed out that the improper combination of operating parameters and the nozzle structure could cause the breakout accident induced by the impinging of the molten steel jet.…”

Section: Numerical Investigation For the Influence Of Turbulent Heat Transfer Of Mushy Zone On Shell Growth In The Slab Moldmentioning

confidence: 99%

Numerical Investigation for the Influence of Turbulent Heat Transfer of Mushy Zone on Shell Growth in the Slab Mold

Xuan

Chen

2022

ISIJ Int.

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“…In recent years, the thermocouple temperature measurement method has been the main method to predict sticker breakout [14][15][16] . Meanwhile, the computer vision method was also used to detect the hot and cold regions of sticker breakout and predict breakout 17) .…”

Section: Introductionmentioning

confidence: 99%

Analysis and Prediction of Sticker Breakout Based on XGBoost Forward Iterative Model

Liu,

Ma,

Wang

et al. 2024

ISIJ Int.

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All 61 sticker breakouts and 183 false sticker breakouts were obtained based on the on-line mould monitoring system during the conventional slab continuous casting. The 16-dimensional temperature characteristics and temperature velocity characteristics of the sticker breakout were extracted. The sticker breakout recognition based on the XGBoost forward iterative model was developed and optimized by the mean square error algorithm. The results show that the prediction probability of the sticker breakout after optimization is in the range of 0.72∼1.00. The smallest output value 0.5 higher than that before optimization. When the threshold is set to 0.65, the optimized XGBoost model can correctly predict all sticker breakouts and has a 99.5% accuracy rate. The XGBoost model has a stronger generalization ability and higher prediction accuracy, which promotes the intelligent production of continuous casting.

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Evaluation of Solidified Shell Thickness by Thermocouple in Mold

Cited by 9 publications

References 7 publications

Influence of heat flux different between wide and narrow face in continuous casting mould on unevenness of hypo-peritectic steel solidification at off-corner

Influence of heat flux different between wide and narrow face in continuous casting mould on unevenness of hypo-peritectic steel solidification at off-corner

Numerical Investigation for the Influence of Turbulent Heat Transfer of Mushy Zone on Shell Growth in the Slab Mold

Analysis and Prediction of Sticker Breakout Based on XGBoost Forward Iterative Model

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