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Vol.31, No.11, 1471 ~ 1481, 1993

Title

Macrosegregaton Behavior in High Carbon Steel CC Blooms during Continuous Casting

오경식Kyung Shik Oh, 이인열In Ryul Lee, 장영원Young Won Chang

Abstract

The macrosegregation behavior in continuously cast(CC) high carbon steel blooms are systematically investigated by carrying out a plant test using a bloom caster at POSCO in connection with the electro-magnetic stirring(EMS) mode and stirring force. The degree of centre soundness is quantitatively measured in terms of the area fraction and size distribution of centre porosity as well as the segregating solutes by using a mapping analysis method. The thicknesswise solidification structures are examined to find out solidification behavior in the centre region of CC blooms and the calculation of specific permeability(k) is also presented to elucidate the formation mechanism of centre defects. The addition of a final stirring(FEMS) to an in-strand EMS(SEMS) is found to increase the solidification rate significantly in the final stage resulting in a more fine distribution of porosities and segregation spots in CC blooms. An optimum stirring forces of SEMS and FEMS are then determined to provide the best centre soundness for the high carbon steel tested. The most effective conditions at the final stage of solidification for the reduction of macrosegregation in CC blooms have also been suggested as a result of this study.

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