Abstract
Surface velocity in the continuous-casting mold needs to be studied to better control the quality of steel products. In this paper, the measurement of surface velocity in a 150 mm × 1270 mm slab continuous-casting mold was investigated. Taking the slag layer into consideration, a numerical simulation was performed which was validated by a particle image velocimetry test. A nail-board experiment was also conducted to measure surface velocity in the continuous-casting mold. The effect of nail diameter used in nail-board experiment on the measurement of the surface velocity was also discussed to improve the precision of nail-board experiment result. The results showed that the maximum surface velocity was 0.739 m/s around the mid-section of the free surface, and the results of nail-board experiments were more accurate when the steel nail diameter was 10 mm.
Highlights
The continuous-casting mold plays an important role in the production of high-quality defect-free steel materials [1,2]
A comparison of the results obtained in the nail-board experiment using nails having a diameter of 5 mm with the results of numerical simulation shows that the curve of the liquid level port, there was a slight fluctuation of the liquid level due to the backflow of the upper circular stream after impinging on the narrow face of the mold
To measure the surface velocity in a 150 mm × 1270 mm slab continuous-casting mold, numerical simulation was used in this paper
Summary
The continuous-casting mold plays an important role in the production of high-quality defect-free steel materials [1,2]. The fluctuation of the liquid level in the mold directly affects the quality of the steel product This liquid level fluctuation, especially at a high casting speed, readily leads to problems such as slag entrapment whereupon the slag is further captured by the solidification front, resulting in slab defects [3,4,5,6]. The effect of the steel nails’ diameter in the nail-board experiment was discussed to improve the precision. The plant experiment (the nail-board experiment) was carried out to further validate the results of numerical simulation and discuss the effect of the steel nail diameter on the measurement of surface velocity
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