| The solidification behavior of steel in continuous casting billet mold was examined by plant test, i. e. tracer(FeS) test in mold and solidification modelling. From the above test, it has been found that solid shell grows linearly with time regardless of steel grades in billet mold. Solidification constant k was found to be 32-37㎜/min for low carbon (C%=0.07-0.19) steel, 41-44㎜/min for high carbon(C%=0.40-0.73) steel, respectively. Unevenness of solid shell along the transversal and longitudinal direction for the low carbon steel grade which solidifies as δ ferrite initially was greater than that of high carbon steel grade. When applied an in-mold electro-magnetic stirring(MEMS), solid shell formed uniformly in thickness direction. Finally, measured solid shell profiles in mold were found to agree well with the calculated results from the solidification modelling. |
|
