submerged entry nozzle for continous casting

PURPOSE: A submerged entry nozzle for continuous casting is provided to secure uniformed thickness of solidification shell to produce slab of high quality by supplying molten steel into a mold without rapid flow variation inside the submerged entry nozzle, thereby guiding even distribution of discharge flow of molten steel. CONSTITUTION: The submerged entry nozzle for continuous casting comprises a cylindrical pipe type upper part(21a); a first conversion part(22a) having a constant cross sectional area; a second conversion part(23) from which cross sectional area is gradually increased; a main conversion part(24a) from which cross sectional area is constantly maintained or gradually increased; and a separation member(25a) installed at the center of the end of the main conversion part(24a) to guide symmetrical flow of molten steel, wherein the cross sectional area of the cylindrical pipe type upper part(21a) is 95 to 98% of cross sectional area of the inlet part of the submerged entry nozzle, the cross sectional area of the first conversion part(22a) is 90 to 100% of the cross sectional area thereof, the cross sectional area of the second conversion part(23) is 100 to 140% of the cross sectional area thereof, and the cross sectional area of the main conversion part(24a) is 110 to 150% of the cross sectional area thereof, wherein the absolute value of variation difference of cross sectional area between the respective sections does not exceeds 6 mm¬2/mm, and wherein a formation angle of the separation member(25a) is 0°