<p>The effects of air-mist nozzles, casting speed, and superheat temperature on the continuous casting process of steel bloom have been investigated. This study aims to examine heat transfer and solidification behavior in all cooling zones including primary cooling, secondary cooling, and radiation zone. Transient, three-dimensional simulation of the continuous casting of bloom production at the Khuzestan steel company (KSC) was conducted to examine the effect of different parameters. The heat transfer and fluid flow equations were solved using ANSYS Fluent, employing the <i>k-ε</i> model for turbulent fluid flow and the enthalpy–porosity method for the solidification process. The results aimed to find the temperature variation, the metallurgical length, and the variations in solid shell thickness for hydraulic and air-mist nozzles at different casting speeds and superheat temperatures. The results show that using air-mist nozzles increases the heat transfer rate by about 50% in the secondary cooling zone and reduces water consumption by up to 35% under similar conditions. It was also found that variations in casting speed significantly impact heat transfer and solidification processes, and increase the possibility of surface and internal defects and crack formation, while slight changes in superheat temperature will not significantly affect heat transfer and solidification.</p>