Patent ID: 7784527

Claim:
A continuous casting method of steel supplying molten steel from a sliding nozzle provided at a bottom of a tundish through an immersion nozzle to the inside of a casting mold, said continuous casting method of steel characterized by giving a horizontal cross section of an inside bore of the immersion nozzle an elliptical shape having the ratio S 1 /S 0 of 0.5 to 0.9, where S 1 is the sectional area of the smallest sectional area part of the inside bore, S 0 is the sectional area of the bore of the sliding nozzle, and making a length ratio of the inside bore of the immersion nozzle D L /D s of a long axis D L and a short axis D s 1.2 to 3.8, making a direction of the long axis parallel to a long side direction of the casting mold, and making the sliding direction of the sliding nozzle a direction perpendicular to said long axis to supply the molten steel in the casting mold.