ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Influence of Soft Reduction with One-piece Rolls on Center Segregation in Continuously Cast Slabs
Shigeaki OgibayashiMasayuki KobayashiMamoru YamadaTatsuo Mukai
Author information
JOURNAL FREE ACCESS

1991 Volume 31 Issue 12 Pages 1400-1407

Details
Abstract

A test on soft reduction employing conventional one-piece rolls was conducted to analyze the influence of soft reduction and reduction timing on center segregation. As a result, the following findings were obtained. Center segregation was improved when soft reduction was applied only in the final stage of solidification in which the fraction of solid at the slab center is larger than 0.25. When soft reduction was applied employing one-piece rolls over the wide range of solidification stage including the solidification stage with the fraction of solid at the slab center below 0.25, center segregation deteriorated with increasing amount of reduction and the amplitude of variations in center segregation in the casting direction was also increased. It is estimated that the deteriorating tendency of center segregation by soft reduction on the upper stream side is attributable to the new flow of molten steel caused by uneven reduction due to mechanical factors such as roll bending. For the improvement of center segregation, therefore, the optimization of reduction timing is indispensable especially when mechanical factors of uneven reduction are present.

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