Simulation Study On The Influence Of Chamfering Structure On The Fluid Flow In Mould Of Slab Continuous Casting Mold

The crack at slab corner is prone to micro-alloy steel in the continuous casting process. This corner defect is involved in the third zone of low ductility in steel. It can be improved that the temperature of the slab corner by chamfered mould, and that is known as one of the most important ways to reduce the crack at slab corner and improve the quality of slab corner. The Study on the influence of chamfering structure on the fluid flow and heat transfer in mould of slab continuous casting mold is very significative.In this paper, numerical simulation and physical simulation is used for the study of the influence of chamfering structure on the fluid flow in mould of slab continuous casting mold. It can be concluded from the study as the flowing points.(1) The region near the narrow side is most affected by chamfer structure on molten steel flow behavior. The farther away from the narrow side, the less the impact would be. The difference of the chamfer structure will induce remarkable effect on the impact depth. The longger of the chamferring, the less impact depth would be.The impact depth of 0mm-length chamferred mould is 70 mm shallower than that of 60-mm chamferred mold.(2) The flow velocity of molten steel level increases at first then decreases from narrow side to the nozzle. The bigger chammer shows great influence to the velocity. The maximum flow velocity of 60mm-chamferred mould is 80% more than that of 0mm-chammerred mould. The wave hight increases at first then decreases from narrow side to the nozzle, and it cames the biggest in the 1/4 position of wide side.(3) The chamferring structure of mould helps to decrease the slag entrapment. The chamfer structure difference do not have an obvious effect on the mold liquid slag coverage situation. This simulation results coincide with experimental measured results.(4) The chamfered mold is effective to improve the corner temperature, and the bigger chamferring structure shows the greater function. The lowest temperature of the corner of the 60mm-chamferred mould is 263 K more than that of 0mm-chammerred mould.In conclusion, this paper combine with numerical and physical simulation, the rule that the chamferring moulde to the fould flow and heat transfer was studied. This work would give the experimental evidence and theoretical basis to the study of slab continuous chamferred mould and the improvement of the the cracks at slab corner.