Improved Calculus of Cooling Condition and Withdrawal Rate for Continuous Casting

Abstract

In the analysis of the solidification process of continuous casting operation, the estimation of modifiedFourier number, H₂=αL/uW², which determines the quantitative relations between the length of thecooling zone and thermal diffusivity, thickness and withdrawal rate of the ingot, has been facilitatedby the adoption of the integral-profile method.
The calculus for continuous casting presented in previous paper by considering the completion offreezing of metals at the end point of the spray cooling zone has been improved and developed tothe new calculus, in which the complete solidification at the position of pinch rolls was taken intoaccount and another dimensionless factor, H₃=αL_p/uW² was introduced.
The values of H₂, m in and H₃, min derived theoretically in this work may be used as the standard onesin decision of the length of cooling zone and the operating conditions.
The values of residence time in cooling zone calculated for three kinds of steels under various coolingconditions have been in good agreement with the estimated values which were presented in other papers, hitherto.