Research on Ultra-Fast Cooling Heat Transfer Coefficient Affecting Law for Hot Strip Mill

Abstract:

The ultra-fast cooling technology has been developed rapidly in order to develop iron and steel material with high performance. A variety of factors including the strip running speed, water temperature, water spray speed and strip temperature will affect strip cooling aspect during ultra-fast cooling process. These factors, which affect heat transfer coefficient, should be analyzed in order to achieve accurate control of strip cooling path during ultra-fast cooling process. The heat transfer coefficients of the hot rolled strip with various cooling parameters were obtained by numerical calculation method. By comparison, the influencing law that the cooling process parameters had made to heat transfer coefficient were obtained. It was found that strip running speed can affect heat transfer coefficient by influencing residual water distribution on top of the strip surface. Water temperature, water spray speed and strip temperature can also affect heat transfer coefficient with different changing law.

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