| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for obtaining suitable molten metal flow by changing the casting condition and the shape of a two-hole immersion nozzle used for casting of a cast slab ranging from the narrow width to the wide width. SOLUTION: The average width of a spouting hole and Ar flowing rage in the immersion nozzle are selected so as to satisfy the following equations. F=4.1Tp/(Nw1.09.Mw3.67)...(1), F=4.1Tp/(Nw1.09.Mw3.67)-2.3×102A-0.45α...(1)'. Wherein, 0.1<=F<=0.4 Tp: spout-flowing rate (m3/sec), Nw: average width of the nozzle spouting hole (m), Mw: long side width of a mold (m), A: Ar flowing rage added in the nozzle (m3/sec),α; angle of the spouting hole (rad). Wherein, 0 <=A<=6.67×10-4, -0.17<=α<=0.70, L>=0.15.
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