Abstract：The secondary cooling is the key link between solidification and heat transfer of continuous casting slab. It improves efficiency of heat transfer through cooling methods such as water nozzle or air-water nozzle in continuous casting slab. In this study, measurement of secondary cooling water distribution was carried out using a single nozzle and a combined nozzle on a medium-thick slab caster in Baosteel group Xinjiang Bayi Iron and Steel Co., Ltd. The layout scheme of nozzles was improved based on the measurements. And, the numerical simulation of surface temperature of continuous casting slab was carried out to verify the correctness of optimization scheme. It has found that the cooling was unexpectedly stronger at the edge of the slab. In order to avoid overcooling on the corner zone, a new nozzle with less cooling intensity was proposed as the optimization strategy. The mathematical simulation of solidification and heat transfer illustrated that the temperature distribution at the edge of slab became more uniform and the transverse temperature of slab was more uniform after the optimization. Thus, the occurrence of crack defects was reduced in the slab continuous casting process.
2019, Vol. 38 