| 摘要 |
PROBLEM TO BE SOLVED: To restrain a variation in a molten steel surface in a casting mold used when continuously casting steel.SOLUTION: Molten steel 1 is injected into a tundish 3 used for continuously casing steel. The molten steel 1 is gathered in the tundish 3. The molten steel is injected into a casting mold via a nozzle 7 of the tundish 3. A casting piece is continuously cast by extracting the molten steel 1 from the casting mold 4 while injecting the molten steel 1 into the casing mold 4. The nozzle 7 of the tundish 3 is opened-closed by a stopper 9. Flux is added to the molten steel 1 in the tundish 3. The flux is 0.1-100 μm in a particle diameter, and is 10.0 or more in basicity (=CaO [mass%]/SiO[mass%]). Basicity of slag 8 formed in the molten steel 1 is set to 3.5 or more by input of the flux.SELECTED DRAWING: Figure 1 |
