The Analysis Of Continuous Casting Slab’s Stress Based On The Creep During Straightening Process

During slab process, continuous casting process has been widely applied comparedwith mould casting process because of its short flow, low energy consumption and quality.In the condition of high temperature, liquid steel begin to cool and solidification, thetemperature of slab constantly changed. Meanwhile, the forced state of slab also changedconstantly by the force of straightening and bending. The change of temperature and forcemutual influenced. It has important theoretical value to improve the production efficiencyof casting machine and slab quality by study the temperature field and force distribution ofslab in continuous casting process.This paper selected the stainless steel0Cr18Ni9as subjects to study the changebetween temperature and force of the slab in the process of continuous casting. The creepexperiments of0Cr18Ni9were carried out based on the basic theory of creep, because theeffect of creep could not be ignored when studying the force distribution of slab in hightemperature. A series of high temperature creep data which could lay a foundation of slabforce analysis were got by Gleeble-3500thermal simulator.This paper built the model of slab temperature field combined with the characteristicsof solidification heat transfer by finite element analysis software-MSC.Marc to study thetemperature change of slab. Part thermal physical parameters and boundary conditionswere loaded to corresponding unit by the control of Table. The simulation results wereverified reasonable by compared to metallurgical criterion of slab solidification heattransfer.This paper built the heat-stress coupled model by the force condition of slab on thebasis of temperature field model and supplied the boundary conditions of displacementand force. The motion of slab in mould was realized by the velocity of defined upper andlower baffle. When the slab left the mould, the motion of slab was controlled by thefriction between roller and slab. When analyze the heat-stress coupled, the creepparameters was set. The stress, strain and strain rate was compared and analyzed with orwithout creep based on the experiment data.