Effect of Dendritic Structure on the Spot Segregation of Continuously Cast Round Bloom
(Room 202B)
08 May 17
9:30 AM
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10:00 AM
Spot segregation in pipeline steel blooms is becoming an increasingly critical issue, as it can deteriorate the qualities of products, especially for sour gas service. In this paper, the solidified dendritic structures of blooms produced under different intensities of mold electromagnetic stirring (M-EMS) were investigated. The quantity, size, morphology and distribution of the spot segregation in blooms were also analyzed. The relationship between the equiaxed zone and the spot segregation was discussed based on the above experimental results. Concentrations of chemical components were measured by EPMA and SEM-EDS to demonstrate the segregation ratio and its dependency on the size of spot segregation. An operational path to reduce the spot segregation was suggested.