DETERMINATION METHOD FOR QUALITY DETERIORATION DANGER OF CONTINUOUSLY CAST SLAB CAUSED BY NONMETALLIC INCLUSION

摘要

To provide a determination method determining whether the danger of the inflow of nonmetallic inclusions generating surface defects in a thin steel sheet product produced by rolling a continuously cast slab in the slab from a tundish is present or not.SOLUTION: A determination method for the quality deterioration danger of a continuously cast slab caused by nonmetallic inclusions comprises a process where, based on the resistance amount of molten steel in a tundish and the injection flow rate of the molten steel per unit time injected from the tundish into a mold, whether the danger of the inflow of nonmetallic inclusions generating surface defects in a thin steel sheet product produced by rolling a continuously cast slab in the slab from the tundish is present or not is determined.SELECTED DRAWING: Figure 2