COOLING DRUM FOR TWIN-DRUM TYPE CONTINUOUS CASTING OF THIN SLAB AND METHOD FOR MANUFACTURING THE SAME

PROBLEM TO BE SOLVED: To provide a cooling drum which is enhanced in a thermal insulating effect and is prolonged in the life of the cooling drum by providing the inside of the drum surface layer of the cooling drum for twin-roll type continuos casting with a multiplicity of holes of a suitable size within and further subjecting the surface to dimpling and method for manufacturing the same. SOLUTION: The cooling drum for twin-drum type continuous casting of a thin slab constituted by having a surface layer of 1 to 2 mm in thickness on the cooling drum, imparting the surface consisting of any one kind among Ni, Co, Co-Ni alloy, Ni-W alloy and Co-Ni-W alloy on its surface, then forming recessed parts of 100 to 2,000 μm in depth, 20 to 80% in area rate and 100 to 1,000 μm in average hole diameter on the surface of this surface layer and further forming the holes by subjecting the surface layer to shot blasting using steel balls of 1.5 to 4.0 mm in diameter and closing the recessed parts and the method for manufacturing the thin slab by using this cooling drum.