Coupled Research On Thermal-Solidification And Shell-Stress In Mold Of Thin Slab Continuous Casting

In the process of thin slab continuous casting of FTSC(Flexible ThinSlab Casting), water channel distribution of copper plate of FTSC’s mold, size of thesection and the inserting depth of the submerged entry nozzle has an important effecton the flow and temperature field of liquid steel and stress distribution of solidifiedshell in mold.According to actual circumstance of FTSC in some Steel Corp, making use ofsome specified technology parameter and referring a lot of document data, athree-dimensional mathematical model of fluid flow, heat transfer and elastic-plasticstress has been developed. Governing equation, initial condition, boundary conditionand the basic mechanics parameters were ascertained. Then simulate the process oftemperature field, heat transfer and stress and strain distribution of liquid steel withthe date in the production conditions when casting speed is4m/min, according tomold section1263×90mm2,1290×90mm2and1546×90mm2in the inserting depth220mm of submerged entry nozzle.The horizontal surface temperature of solidified shell are obvious more uniformusing non-uniform designed of mold’s water-channel; Under the specifiedwater-channel designed, with the increasing of slab section, solidified shell thicknessof slab’s narrow face is relatively more thin; Internal stress in crystallizer are mainlythe thermal stress, i.e. stress caused by the difference solidification degree of eachportion of the solidified shell; Distribution of water channel cause a great influence onthe stress distribution of solidified shell mold; The change of stress state in solidifiedshell due to the thermal properties of materials; Effective stress will exceeds thecorresponding yield strength the position where the solid fraction of solidified shell islower, then will be exceeded by corresponding yield strength with the increase ofsolid fraction.According to the results, it provides not only the reference to the actualproduction, but also theory and data to optimize the design of FTSC mold and it’sSEN.