CONTINUOUS CASTING METHOD OF HOLLOW ROUND STEEL

摘要

PURPOSE:To obtain an excellent hollow round steel having no defects on the inside surface without any restriction in length, by inserting a steel pipe connected above a mold into the mold and using the same as a core. CONSTITUTION:A steel pipe 3 serving as a core is connected continuously by a socket and spigot system and/or welding above a mold 5. While the steel pipe 3 is inserted continuously in the central part of the mold 5, the molten steel 2 in a tundish 1 is charged between the pipe 3 and the mold wall. The inside surface of the pipe 3 inserted in the mold 5 in this stage is cooled by feeding water or air. The cast steel and the pipe 3 are drawn out in one body. The excellent hollow round steel having no defects on the inside surface is thus obtd. without any limit in the length.