| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method and a cast continuous casting cast piece for facilitating a center segregation countermeasure by light draft, without causing a facility cost burden.SOLUTION: The continuous casting cast piece having a bulging quantity of a short side surface of 4.5 mm or more, is formed, and a cast piece thickness of a width end part is thinned thereby, and draft reaction from a short side coagulation shell in the width end part vicinity is reduced in the light draft, and the sufficient light draft is realized, and center segregation can be reduced. The continuous casting cast piece has characteristics that the oscillation mark depth in an area up to 50 mm from the width end part of a long side surface is 0.5 mm or more and the oscillation mark depth in a width center part of the long side surface is 0.3 mm or less. The continuous casting cast piece having the bulging quantity of the short side surface of 4.5 mm or more, can be formed by setting the water amount density ratio win the short side up to 500 mm under a casting mold from just under the casting mold of the short side in continuous casing to 300 L/mor less in an average. |
