Ingot casting method

Abstract

To provide a casting method for an ingot suitable for manufacturing a large-sized ingot that can suppress internal defects of the ingot, such as macro segregation, inclusion defects, and shrinkage cavities.SOLUTION: A casting method for an ingot having a tapered shape with D1>D2 where the height of the ingot body is H, the diameter of the inscribed circle at the top end part is D1, and the diameter of the inscribed circle at the bottom end part is D2. The casting is conducted using an ingot case where the average inscribed circle diameter D in the vertical direction defined by Formula (1): D=(D1+D2) / 2 and taper t defined by Formula (2): t=(D1-D2) / H satisfy the relation defined by Formula (3): t / D≥0.15.SELECTED DRAWING: Figure 1

Claims

[Claim 1] A casting method for an ingot having a tapered shape where D1 > D2, where H is the height of the ingot body (m), D1 is the inscribed circle diameter at the upper end (mm), and D2 is the inscribed circle diameter at the lower end (mm), wherein the average inscribed circle diameter D (mm) in the vertical direction, defined by equation (1), and the taper t (mm / m), defined by equation (2), satisfy the relationship defined by equation (3), and the taper t is 150 mm / m or more, and the ingot is cast by bottom pouring using an ingot case. [Math 1] [Math 2] 【Number 3】

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