Research On Thermal State In The Mould Of FTSC Thin Slab Continuous Casting

In continuous casting process of the flexible thin slab caster (FTSC), the factors such as the water-channel distribution, size of section in the crystallizer copper plate and inserting depth of the submerged nozzle have directly effect temperature distribution on the copper, flow and temperature field of liquid steel in the crystallizer.The FTSC process parameters and actual data used in this paper is provided by a steel works, and the numerical simulation analysis for temperature distribution on the crystallizer copper, the process of heat transform and flow of liquid steel in the mold is completed by CFD in these cases as the casting speed is 4m/min, size of section are 1263x90mm and 1546x90mm, the inserting depth of the submerged nozzle is 120mm, 170mm,220mm.For calculated result, the maximum heat flux of copper plate which are designed by uniform and non-uniform for the water-channel distribution in the size of 1260×90mm slab section are respectively 3.01×106 W/m2 and 2.33×106 W/m2; The heat flux is changed along the width of the mold of both small and large slab section; The temperature appear cloud shape along the mold and reduce gradually from top to bottom; There is a high temperature local zone on the top of the mold copper plate that the water-channel are designed by uniform and non-uniform, the value is 315℃ and 264℃. The result that analyzing the process of the liquid steel’s flow and heat transfer in the mold display that the impact depth of stream is increase with depth insert of submerged nozzle, and has no conductive for growing of shell, the thickness of billet shell at the exit of mold is 9.9mm and 8.1mm correspond respectively to uniform and non-uniform water-channel mold.It is more conducive to optimization design for mold and submerged entry nozzle that the heat flux calculated from the true temperature data of FTSC s copper plate is used in the numerical simulation analysis of temperature field on the copper plate of the mold and liquid steel’s flow and heat transfer in the mold compared with Savage empirical formula.