| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method of a double layered cast strip having different concentration of a solute between a surface portion and an inner portion, which method can furthermore easily cast the double layered cast strip without using a plurality of kinds of molten steel. SOLUTION: In the continuous casting method of the double layered cast strip having different concentration of the solute between the surface portion and the inner portion, the molten steel 3 is poured toward both short sides 1a of a casting mold 1 in the horizontal direction or in the diagonally downward direction than the horizontal direction from two discharge ports 2a of an immersed nozzle 2, a lower end of which is immersed in the central portion of the cross section of the molten steel 3 in the casting mold 1. At the same time, molten ferrous alloy 5 containing 10 mass% or more of non-ferrous components is added vertically downward from one discharge port 4a provided on the bottom portion of a straight nozzle 4, a lower portion of which is immersed in the molten steel 3 at the symmetric position on both short sides 1a with respect to the immersed nozzle 2. According to the present invention, the cast strip having different concentration of the solute between the surface portion and the inner can be easily and continuously cast without using a plurality of kinds of molten steel. COPYRIGHT: (C)2009,JPO&INPIT
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