Slab continuous casting chamfer crystallizer narrow-face copper plate capable of effectively controlling longitudinal cracks of corners

Abstract

Disclosed is a slab continuous casting chamfer crystallizer narrow-face copper plate capable of effectively controlling longitudinal cracks of corners. The working faces of a narrow-face chamfer copper plate (1), which contact with molten steel, comprise a chamfer surface (3), a chamfer surface (4), a plane portion (2) between the two chamfer surfaces, width portions (5 and 6) of the chamfer surfaces (3 and 4) at the positions of the upper opening of a crystallizer and width portions (7 and 8) of the chamfer surfaces (3 and 4) at the positions of the lower opening of the crystallizer. The narrow-face copper plate is characterized in that the sizes of the width portions (7and 8) of the chamfer surfaces at the positions of the lower opening are larger than those of the corresponding width portions (5 and 6) at the positions of the upper opening respectively, so that tapers are formed on the chamfer surfaces (3 and 4) from the width portions (5 and 6) of the chamfer surfaces (3 and 4) at the positions of the upper opening of the crystallizer to the width portions (7 and 8) of the chamfer surfaces (3 and 4) at the positions of the lower opening of the crystallizer, under the condition of different shrinkage masses of solidified shells of the inner width face and the narrow face of the crystallizer, air gaps formed on the chamfer faces due to large shrinkage mass of width faces are eliminated by means of the taper compensation on the chamfer faces, and the longitudinal cracks of the corners and the bleed-out accidents caused by the longitudinal cracks are avoided.

Description

technical field [0001] The invention relates to the technical field of metal solidification and continuous casting, in particular to a narrow-faced copper plate of a slab continuous casting chamfering crystallizer which can effectively control corner longitudinal cracks. The combined slab continuous casting chamfering crystallizer has a tapered narrow face copper plate. Background technique [0002] Due to the two-dimensional heat transfer characteristics of the corner of the right-angle continuous casting slab, the corner temperature of the continuous casting slab is relatively low, and it is easy to fall into the high-temperature brittle zone of the steel during straightening, resulting in corner transverse crack defects. For a long time, metallurgists have done a lot of work to solve the problem of corner transverse cracks in right-angle continuous casting slabs. However, due to the characteristics of two-dimensional heat transfer at the corners of right-angle continuous ...

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Problems solved by technology

[0006] Chinese patent 200720089029.7 discloses a slab chamfering mold with four corners as transitional curved surfaces in the cross-section of a rectangular cavity. Analysis of this patent shows that the width of the upper and lower openings on the chamfering surface is equal, so the inner width of the crystallizer is not considered. The effect of different shrinkage of the narrow face on the heat transfer and growth of the chamfered shell

[0007] Chinese patent 200720175143.1 discloses a slab crystallizer in which the four corners of the rectangular inner chamber cross-section are circular arc transition surfaces. The width of the upper and lower openings on the chamfered surface of the patent is equal, so the shrinkage of the inner width and narrow surfaces of the crystallizer is not considered. Influence of chamfered shell on heat transfer and growth

The design does not specify the size of the key parts, and the width of the upper and lower openings on the chamfered surface is equal, so the influence of the different shrinkage of the inner width and narrow surface of the crystallizer on the heat transfer and growth of the chamfered shell shell is not considered.

[0009] Chinese patent 200520089594.4 discloses a slab crystallizer with four corners of a rectangular inner chamber with convex edges. The angle between the convex edge and the wide and narrow copper plates is 45°. Influence of Different Shrinkage of Wide and Narrow Surfaces in Mold on Heat Transfer and Growth of Chamfered Shell Shell

[0010] Chinese patent 200920035404.9 discloses a slab crystallizer in which the four corners of the rectangular inner cavity cross-section are arc transition surfaces. The width of the upper and lower openings is equal, so the influence of the different shrinkage of the inner width and narrow surface of the crystallizer on the heat transfer and growth of the chamfered shell shell is not considered

[0011] Chinese patent 201020205143.3 discloses a slab crystallizer with a round hole cooling water channel at the chamfering part. The cooling method of the round hole water channel is not only complicated in structure, but also difficult to maintain and clean, poor in practicability, and the width of the upper and lower openings on the chamfered surface Therefore, the influence of the different shrinkage of the wide and narrow surfaces in the crystallizer on the heat transfer and growth of the chamfered shell shell is not considered

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