Numerical Study Of The Liquid Core Reduction For Thin Slab Continuous Casting

Liquid core reduction (LCR) in thin slab continuous casting is a novel continuous casting technology, which combines solidification with large plastic deformation, continuous casting with direct rolling in a single process. This new technology has apparent advantages of energy-saving, reduction of process flow and high product quality. It can also solve the problem which matching thickness between thin slab continuous casting and direct rolling. So the technology has become the highlight in modern metallurgical industry and is sure to be one mainstream in continuous casting technologies.According to the actual situation of thin slab casting product line in Tangshan Iron and Steel Company, this paper establishes a three-dimensional finite element model of LCR process. Thermal and displacement boundary conditions are determined. Based on elastic-plastic theory, LCR technology was studied by MSC.Marc.By numerical simulation of LCR process, the temperature field, solidification of thin slab, and deformation characteristics including the deformation of slab's bulge are obtained during LCR continuous casting. The results are in line with actual production. The external part of the solidified shell is under the compressive stress state, and the internal part is under the tensive stress state, so internal crack is engendered easily. The strain and the stress of the solidification forefront can't exceed the critical strain and stress in order to prevent the formation of crack. This paper also chooses the suitable pattern during LCR continuous casting.The research results demonstrated that choosing craft parameters of LCR reasonably is an important means to control the stress and deformation of the slab, prevent the internal crack and make implementation of LCR successful. The simulation results supplies a reasonable base and scientific theoretical foundation for real production in this paper.