PURPOSE: To increase casting speed in such a way that said speed can follow up rolling speed, by running molten steel down continuously into a liquid cooling medium to solidify said metal quickly and to cast a cast material, and controlling down-flow speed and casting size by means of an electromagnetic coil.

CONSTITUTION: The molten metal 4 in a tundish 1 is run continuously through a charging nozzle 2 into the liquid cooling medium 5 in a cooling medium vessel 13, whereby the metal is cooled and solidified quickly and a cast material 11 is cast continuously at a high speed. Here, an electromagnetic coil 3 is equipped on the outside circumference of the nozzle 2 to control the downflow speed of the metal 4 and the size of the material 11. The downflow speed of the metal 4 can be increased by selecting properly a fall between a molten metal level of the tundish 1 and a level of the medium 5. The material 11 is uniformly looped in the medium 5 and is supplied via a taking up roll 6 to a rolling mill group 7, whereby the material is rolled.