Development of Soft Reduction Technology Using Crown Rolls for Improvement of Centerline Segregation of Continuously Cast Bloom

Abstract

In order to improve centerline segregation of continuously cast bloom, effective technology of soft reduction with crown roll has established. The centerline segregation is improved remarkably by application of optimum conditions of this technology and combination of promotion of equiaxed solidification and proper soft reduction is able to decrease the degree of segregation much more.
The optimum rate of reduction of this technology is analyzed with calculation of solidification of continuously cast bloom and analyses of deformation of bloom by soft reduction and the calculated results were compared with experimental results.
Furthermore mathematical models were developed to analyze the relation between reduction force and amount of reduction. The effects of profile of reduction roll and number of reduction roll etc. on above relation and behavior of load transfer in segment for soft reduction were clarified by calculations with these mathematical models.