Cooling And Solidification Process Of Thick Slab Continuous Casting In Numerical Simulation

This paper use the numerical simulation to study the cooling and solidificationprocess of continuous casting slab. The research object is the2900×150mm Q345steel.In all aspects of the continuous casting,the slab surface and central temperatureand the solidification process are follow-up study by the two-dimensional slicemethod.The relevant impact factors including casting speed, cooling intensity andsuperheat effect on the cooling and solidification process of slab are also analyzed.The simulation results offer guidance to optimalize the process and control the slabquality.The slab surface temperature is measured by infrared camera in the export of thesecondary cooling zone.The maximum error between the surface temperaturemeasurement value and simulation value is2.9%, and the average error is1.47%.Thisshows that the model and the boundary condition are accurate.Simulation results show that under the typical production conditions (castingspeed is1m/min, superheating temperature is20℃), the slab shell thickness out ofthe crystallizer is17.1mm.The surface central temperature of the slab is1069℃before it entering the straightening area.The distance between the end of the slabsolidification and the meniscus surface is7m,that shows the slab is straightenedwithout liquid core.The effect of the casting speed on slab is the biggest.. When the casting speedranged from0.85m/min to1m/min in secondary cooling zone,the temperature of theslab surface central and corner increase80℃and65℃.When the casting speedranged from1m/min to1.15m/min,the temperature of the slab surface central andcorner increase70℃and130℃.And when the casting speed increasing0.15m/min,the distance between solidification end point and meniscus surface increases0.8m.The effect of the cooling intensity of the secondary cooling zone on slab issmaller.When the cooling water volume increased10%,the slab surface central andcorner temperature and the slab central temperature decrease25℃,10℃and15℃,and the solidification end point distance from the meniscus surface decreases about0.3m.The effect of the superheat on slab is minimal.When the superheat increased10℃,theslab surface central and corner temperature and the slab central temperature and thesolidification end point to the meniscus do not change significantly.