Study Of Solidification Heat Transfer Mathematical Model For Dynamic Withdrawal Process In Slab Continuous Casting

Unstable temperature distribution of slabs in solidification process has a large effect on quality of slab. Therefore, it is necessary to find a way to resolve the problem. According to the theory of heat transfer and solidification, we study the solidification heat transfer of dynamic casting process in slab continuous casting. By selecting proper technological parameters such as casting speed, specific water amount, superheat and so on we can obtain stable temperature distribution and then effectively improve the inner quality of slab.Based on the thorough research of slab caster in this paper, we set up a more comprehensive solidification and heat transfer mathematical model for dynamic casting process in slab continuous casting and take real heat flux distribution of the slab surface as boundary condition. TDMA algorithm is utilized to solve the mathematical model and simulating software is developed making use of popular developing tool Visual C++ 6.0. Interface design of the simulating software gives prominence to usability, flexibility and reliability. In the simulation software, the whole strand is assumed to be composed by many conjoint slices moving at casting speed, and their position and life-time during casting, being necessary to the prediction under changing of casting speed, are traced and recorded respectively.The simulating software and test results were used to simulate and compute the heavy slab caster in No.1 Steelmaking Plant of Anshan Iron & Steel Co. in this paper. The influence of the technological parameters such as casting speed, specific water amount and superheat are analyzed. In given secondary cooling system, increasing casting speed and superheat, or decreasing specific water amount will reduce the shell thickness at mold exit and increase the depth of liquid pool in different extent. The conclusion is that the influence of casting speed on the shell thickness at mold exit and the depth of liquid pool is most distinct, and the shell thickness at mold exit is the restrict factor of maximum casting speed of heavy slab caster in No.1 Steelmaking Plant of Anshan Iron & Steel Co.. For improving the slab quality and the production capacity, this research would offer significant theoretical guides as well as practical value.