Effect of casting speed on solidification structure and central macrosegregation during continuous casting of high-carbon rectangular billet

摘要

Production of continuously cast high carbon steel that very low center macrosegregation is an important objective in meeting high quality requirements. Product quality and production efficiency depend essentially on the appropriate casting speed. In the present research, the solidification structures and macrosegregation of high carbon rectangular billet with a section size of 180 mm×240 mm in different casting speeds were simulated using ProCAST. The adequacy of the model was compared with the simulated and actual surface temperature and macrostructures of 82B steel. The effects of different casting speeds on solidification structures including the total grain number of whole cross section of the rectangular billet and carbon macrosegregation were calculated. Besides, an industrial test was conducted to investigate the effects of different casting speeds on dendrite morphology and center carbon macrosegregation of 82B steel. A similarity between the calculated and industrial result is achieved. Decreasing the casting speed from 1.35 or 1.30 to 1.25 m/min could increases the cooling intensity and decreases the centreline carbon macrosegregation.