Thermo-mechanical Couple Analysis On Secondary Cooling System For High Strength Steels Slab

Continuous casting technology is a key technology in the steel production process, solidification and heat transfer process of continuous casting billet plays a decisive role in the quality of the final steel, the secondray cooling zone is a main part of the continuous casting process, heat transfer is finished in the secondray cooling zone, and a lot of quality defects are caused by the secondray cooling. Therefore, in order to improve the quality of continuous casting billet, it is necessary to conduct further research on the secondray cooling zone of continuous casting.Taking the high strength steel plate produced by a steel plant as the research object, temperature field in the slab continuous casting process are simulated by establishing the solidification and heat transfer of slab model. Based on the analysis of the variation law of temperature and thickness of slab, the shrinkage defect of slab was simulated through the indirect coupling method, and the influence of process parameters such as casting speed, superheat and specific water rate on the slab temperature, shell growth and center shrinkage hole was studied. The following conclusions are drawn:1) Through the simulation analysis of the temperature field field in the slab continuous casting process, the variation law of the slab temperature, the shell thickness and the thermal stress is obtained. The results are in accordance with the metallurgical criterion, which can provide reference for the actual production.2) It is proposed for an analysis method of slab center shrinkage hole, shrinkage hole in the center of the forming process is simulated. The results show that in the original content, the casting speed is 1.6m/min, superheat temperature is 30 degrees centigrade, without considering the billet using light pressure under the condition of the heart will produce shrinkage.3) The influence of the process parameters such as casting speed, superheat and specific water rate on the slab temperature, shell thickness and slab center shrinkage is compared. The results show that the influence of casting speed is greater, and the influence of superheat and specific water rate is not obvious.