Abstract
In the present work, mathematical modeling combined with measurement of the velocities near mold surface with rod deflecting method at the high temperature was carried out to optimize the flow field of slab continuous casting mold with medium width of 1230 mm for the production of an automobile exposed panel. The results show that the measured results of the velocities near the mold surface are in good agreement with the calculated results. The velocities near the mold surface increase with increasing the casting speed and decreasing the argon gas flow rate. When the casting speed is increased from 1.0, to 1.3, 1.5, and 2.0 m/min, the flow pattern in the mold is changed from single-roll flow (SRF), to unstable flow (UF), and then to double-roll flow (DRF), the top surface level fluctuations has the smallest value at 1.5 m/min. When the argon gas flow rate is 1 and 4 L/min, the velocity near the mold surface has a moderate value, and the flow pattern in the mold is DRF and the top surface level fluctuation is small and symmetrical. When the submerged entry nozzle (SEN) submergence depth is increased to 200 mm, the velocities near the mold surface decrease, and the top surface level fluctuation becomes small. The optimized flow field in the mold can be judged to be favorable to the surface quality of the automobile exposed panel; if the velocities near the mold surface are relatively small, the flow pattern in the mold is DRF and the top surface level fluctuation is small and symmetrical.
Highlights
The production of automobile exposed panel covers different processes, including steelmaking processes, such as hot metal pretreatment, converter blowing, secondary refining, continuous casting, as well as processes after steelmaking, such as hot rolling, cold rolling, and hot-dip galvanizing
The results show that the velocities near mold surface increase with increasing casting speed because of increasing mean velocity of molten steel exiting submerged entry nozzle (SEN) ports and lowering the argon gas volume fraction, which encourage higher surface velocities [28]
When the argon gas flow rate is 10 L/min and 15 L/min, the velocities near the mold surface become negative values which mean the flow direction is from SEN to the narrow wall, and indicate that the flow pattern of molten steel in the mold is changed from double-roll flow (DRF) to single-roll flow (SRF)
Summary
The production of automobile exposed panel covers different processes, including steelmaking processes, such as hot metal pretreatment, converter blowing, secondary refining, continuous casting, as well as processes after steelmaking, such as hot rolling, cold rolling, and hot-dip galvanizing. The flow field in the mold has a great impact on the surface quality of automobile exposed panel It is widely accepted by the steelmaking researchers that there are three flow patterns in the mold with bifurcated submerged entry nozzle (SEN). For optimizing the flow field in the continuous casting mold of slab with medium width of 1230 mm for automobile exposed panel production, a rod deflecting method for directly measuring velocities near the mold surface at a high temperature was used to quantify the velocities near the mold surface, confirm the flow patterns, and verify the numerical simulation results. The influence of casting speeds, argon gas flow rates, and SEN submergence depths on the velocities near the mold surface, the flow pattern, and the top surface level profile in the mold were investigated using the verified mathematical model
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