Heat Transfer Simulation for Covers in Continuous Casting Process of Steel and Its Application.

A heat transfer model for covers in steel continuous casting process has been established. In the model, the boundary temperature of bloom is firstly calculated by a calibrated three dimensional heat transfer model for continuous casting strand. The cover model has been developed based on heat transfer and surface to surface radiation, and most important, the cover effect is evaluated by specially designed probes placed close to the bloom surface. Then the influences of cover's thermo-physical properties and geometry have been fully studied, including the emissivity, thermal conductivity, specific heat, size, shape and structure. And then some principles for cover design have been presented. According to the numerical model and analytical analysis, the final emissivity reduction of cover is determined by cover's emissivity, bloom's emissivity, the gap between bloom and cover, and cover's thermal conductivity. Besides, the transient time is proportional to the cover's density, cover's specific heat and cover's thickness. Finally, the cover model has been applied to improve the cover effect and improve the heat transfer model of strand. Results indicate that the improved model is much better agreeing with the measurements, by reducing the maximum error from ± 30 °C to ± 16 °C. [ABSTRACT FROM AUTHOR]