| 摘要 |
PURPOSE:To contrive to eliminate center segregation by obstructing a flow of molten metal by electromagnetic force at a position between starting of the molten metal pouring into a mold and finishing of solidification, and shearing a hollow casting slab produced along the hollow part. CONSTITUTION:The molten steel is supplied into a mold 1 through a nozzle 2 of a tundish. Its heat is lost through molten powder 3 and solidification of the casting slab is advanced from its peripheral part to form whole solid steel 5. In this solidifying stage, the molten steel is excited by a moving magnetic field generator 6 to generate the electromagnetic force toward upward and obstruct the flow of the molten steel toward downward, and then, the casting slab steel having hollow part 7 is formed. Next, the casting slab steel having hollow rectangular section is sheared along the hollow part and divided into two pieces for slab steel 5. In this way, the good quality slab steel having no center segregation is formed efficiently. |
