Patent ID: 8245760

Claim:
A method for manufacturing a continuous cast slab with a thickness of 100 mm or more using a continuous casting machine, wherein when a cast slab is continuously casted using at least one segment having a plurality of upper and lower rolls facing each other in a thickness direction of the cast slab, a region of which solid fraction is in the range of 0.05˜0.2 to 0.3˜0.6 in a center portion of the cast slab is reduced in the thickness direction of the cast slab, a reduction gradient of the segment is set to 5 to 20 mm per 1 m length in a casting direction, and a reduction amount of the segment is increased along downstream of the casting direction to let solute-enriched residual molten steel flow back to a molten steel free flow region toward an opposite direction to the casting direction so that the center portion of the cast slab has negative segregation.