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Recently higher slab cooling capacities have been needed to cope with high speed casting operation over the wide range of water spray rates in the secondary cooling process. However, there are few reports on the cooling capacity of the secondary cooling process, especially the spray thickness and the collision pressure in the casting direction. In this study, laboratory experiments on the cooling capacities of hydraulic and mist spray nozzles are carried under various conditions by developing several kinds of spray nozzles. From the experimental results, in order to achieve a high cooling capacity in a spray nozzle, it is important to select the proper spray thickness and collision pressure when designing the nozzle. As a result, the following new estimation equation for the total heat transfer coefficient is proposed based on a new parameter, that is, the product of spray thickness (Ld) and collision pressure (P). have.=6.21×Ld×P+397. This equation can be used to estimate the cooling capacity of spray nozzles without carrying out experiments with a heated sample plate.

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