Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Controlling of Centerline Segregation of Continuously Cast Bloom by Continuous Forging Process
Seiji NABESHIMAHakaru NAKATOTetsuya FUJIIKohichi KUSHIDAHisakazu MIZOTAToshio FUJITA
Author information
JOURNAL FREE ACCESS

1993 Volume 79 Issue 4 Pages 479-485

Details
Abstract

A continuous forging process has been put into operation to prevent the formation of centerline segregation in continuously cast bloom. In the process, the solidifying bloom is continuously forged down by a pair of anvils installed in the strand so that the solidifying shells are pressed into contact each other. In consequence of the application of the forging process on the casting, internal properties such as macro-and semimacro-segregation of the bloom are markedly improved. Segregation ratio of carbon at central part in the bloom can be controlled at the aimed value between 0.6 and 1.0 depending on the central solid fraction in the bloom at forging.
A mathematical model which explains the discharge of solute enriched liquid from the solid-liquid coexisting region to the upper liquid region was developed. The calculated result shows that discharge ratio of liquid out of the solid-liquid coexisting region increases as solid fraction decreases. The discharge ratio is approximately equal to that of the fractional solidification refining reported by Flemings et al. The macro-segregations calculated from the model are in good agreement with observed ones for carbon, manganese, phosphorus and sulphur.

Content from these authors
© The Iron and Steel Institute of Japan
Previous article Next article
feedback
Top