| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for melting a Ti-containing ferritic stainless steel without clogging of immersion nozzle and obtaining a cast slab free from surface defects. SOLUTION: In a tundish, a slag composition is regulated so that it satisfies FeO+MnO+Cr2O3<=3% and CaO/(SiO2+Al2O3)=1.0 to 3.0, and also a steel composition is regulated so that it contains 0.01-0.3% Ti and 10-30% Cr and satisfies T [O] concentration <=70 ppm and log [Ti (ppm)×N (ppm)×C (ppm)] <=8.5. Further, a Ca-containing metal wire is added to the molten steel in the tundish under the following condition: log[C×13.3+118.6×B/A]]=0.5 to 2.5 (where A is the diameter (mm) of the metal wire; B is the coating thickness (mm) of the metal wire; and C is the feed speed (m/min) of the metal wire).
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