Patent ID: 8225843
Filing Date: 2012-07-24
Classification: B22D

Abstract:
1. A mold for continuously casting a round billet with a curved type continuous casting apparatus, in which the mold has an upper edge, a lower edge, and a cooled mold surface extending between the upper and lower edges, the mold also having an inner diameter D 0 (m) at the lower edge thereof, and an outer curvature side thereof is configured to have a curvature radius R 0 (m) at the lower edge thereof, wherein D is a mold inner diameter at a distance x away from the upper edge of the cooled mold surface and dD/dx represents a change in D with respect to a change in x, and R is a curvature radius of an outer curvature side at a distance x away from the upper edge of the cooled mold surface and dR/dX represents a change in R with respect to a change in x, the mold being characterized in that: given that a rate of change Tp (%/m) in mold inner diameter per unit length along a casting direction is expressed by Formula 1, and a rate of change Rp (%/m) in curvature radius of an outer curvature side per unit length along the casting direction is expressed by Formula 2, the rate of change Tp in mold inner diameter and the rate of change Rp in curvature radius satisfy a relationship expressed by Formula 3;