Genetic Influence of Mold Corner Structure on the Strand Corner Temperature in Secondary Cooling Zone During Slab Continuous Casting

摘要

Mold corner structure will influence the strand corner temperature by changing fluid flow and heat transfer of liquid steel at mold corner. A three-dimensional model coupling fluid flow and heat transfer in the mold and a two-dimensional moving-slice heat transfer model in secondary cooling zone was established to investigate slab corner temperature under different mold corner structure: right-angle, big-chamfer, multi-chamfer and fillet. Results show that strand corner temperature increases obviously at mold exit through using chamfered mold. Compared with the corner temperature of right-angle strand, corner temperature of big-chamfered, multi-chamfered and fillet strand are promoted during the straightening process, which will avoid the low ductility temperature zone. When mold corner structure changed from right-angle to big-chamfer, the rise of corner temperature is much higher than that changed from big-chamfer to multi-chamfer or fillet.