| 摘要 |
PROBLEM TO BE SOLVED: To enable variation in Ti concentration contained in steel to be suppressed.SOLUTION: A slag composition at a finishing time point of ladle-refining in production of silicon-deoxidized steel containing Si:0.1 to 3%, Al:0.0001 to 0.005% by performing ladle-refining on a molten steel, contains CaO/SiOof 0.5 to 1.8, AlOof 4% to 20%, MgO of 15% or less (not including 0%). By adding oxide containing TiOto the steel, the slag composition further contains TiOof 1.5 to 10% and further satisfies CaO+SiO+AlO+MgO+TiO≥90%, 0.4≤TiO/MnO≤5 and 1≤TiO/T.Fe≤10.SELECTED DRAWING: Figure 1 |
