Numerical simulation of solidification process for Q345R thick slab continuous casting
In order to improve the quality of Xianggang Q345R thick slab casting billet,a solidification heat transfer model was established and was verified and corrected by nail shooting experiment.Through numerical simulation,the existing production process was evaluated,and the influence of cast-ing speed,cooling water,superheat,thickness and width of casting billet on the pressing position and pressing interval were studied respectively,and their influence on the corner temperature of the casting billet was studied.The simulation results are analyzed,and the reasonable continuous casting process parameters and billet specifications during the production of the steel grade are obtained as follows:the cross-section is 450 mm×2 270 mm,the tensile speed is 0.55 m/min,the superheat is 15～25 ℃,and the specific water volume of secondary cooling is 0.26 L/kg,the straightening zone is Seg.8～9,and the light pressure area is Seg.13～15.With these casting parameters applied,the center segregation of the slab and the crack defects in the corners can be effectively controlled.
continuous castingpressure vessel steelthick slabsnail shooting experimentnumerical simulationsoft reductioncentral segregationcracks in the corners
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