Abstract
For the purpose of increasing the capacity of an Angang Strip Production (ASP) continuous caster and the surface quality of a medium-thin slab with mold sections of 150 × (1020–1540) mm2, the present work investigated the influences of the submerged entry nozzle (SEN) structure and main operating parameters on the flow characteristic and temperature distribution in the mold by physical and numerical simulations. The results showed that the typical “double-roll” flow and a central jet were formed through the three-port SEN. With the original SEN, the mean wave height exceeded the critical value of 5.0 mm after the casting speed was increased due to the strong upper recirculation flow. By the slight increment of the bottom port area and the side port angle of SEN, the mean wave height was obviously decreased below 4.4 mm due to the depressing of the upper recirculation flow after the casting speed increased. Meanwhile, the temperature distribution was slightly changed by using the optimized SEN. The practical application showed that the breakout rate decreased from 0.349% to 0.107% and the surface defect rate decreased from 0.54% to 0.19% by using the optimized SEN, while throughput reached the new level of 3.96 t/min.
Highlights
IntroductionThe control of flow field and temperature distribution is one of the key technologies for defect-free slab/boom production [1,2,3,4,5]
Many studies have been conducted regarding the characteristics of the fluid flow and temperature distribution [6,7,8,9,10,11,12], as well as the control technologies [13,14,15,16,17,18,19,20,21,22,23,24] for continuous casting of different molds, including bloom, conventional slab and thin slab based on practical conditions
Similar to the common casting mold, it is observed that the jet flow exiting the side ports of the submerged entry nozzle (SEN) forms the typical “double-roll flow” [6] pattern after impacting the narrow face where they are split into two loops
Summary
The control of flow field and temperature distribution is one of the key technologies for defect-free slab/boom production [1,2,3,4,5]. Many studies have been conducted regarding the characteristics of the fluid flow and temperature distribution [6,7,8,9,10,11,12], as well as the control technologies [13,14,15,16,17,18,19,20,21,22,23,24] for continuous casting of different molds, including bloom, conventional slab and thin slab based on practical conditions. The structural design [13,14,15,16,17,18] and submergence depth [5] of the submerged entry nozzle (SEN) are considered to be one of the key points during the continuous casting process
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