Method for weakening corner part heat transmission of continuous casting crystallizer

Abstract

The invention discloses a continuous casting crystallizer and particularly relates to a method for weakening corner part heat transmission of a square, rectangle or plate type continuous casting crystallizer. The method for weakening corner part heat transmission of the continuous casting crystallizer is that a thermal insulation material is added in the interior of the wall thickness of a corner material or the outer wall surface of the continuous casting crystallizer so as to weak the two-dimensional heat transfer intensity at corner parts of the continuous casting crystallizer and allow the shell of a casting blank to be solidified evenly at the corner parts and side edges of the continuous casting crystallizer; the interior of the wall thickness of the corner material of the continuous casting crystallizer refers to a range starting from the upper opening of the continuous casting crystallizer to a position 100-300 mm below a liquid steel casting meniscus. According to the invention, a deep hole type heat insulation structure, a trough-type heat insulation structure or a coating type heat insulation structure is used for weakening corner part heat transmission; the method can control the two-dimensional heat-transfer capability at corner parts of the continuous casting crystallizer, better realizes even solidification of the casting blank in the continuous casting crystallizer, and reduces the occurrence rate of corner part defects of the casting blank.

Description

technical field [0001] The invention relates to a continuous casting crystallizer, in particular to a method for weakening corner heat transfer of a square, rectangular or plate type continuous casting crystallizer. Background technique [0002] For square, rectangular or plate continuous casting molds, it is well known that the corners are two-dimensional heat transfer and cause the corners of the slab to cool more intensely than the sides, and the shells at the corners also thicken first to produce larger solids. Shrinkage, thereby exerting a tensile stress on the side slab shell, which is likely to cause defects such as surface cracks in the area near the corner of the slab side. [0003] In the prior art, Chinese patent 03262727.0 discloses a groove on the outer wall of the crystallizer and a raised structure at the corner of the outer wall of the mold. Weaken the two-dimensional heat transfer strength at the corner. This patent is theoretically the easiest to achieve ...

AI Technical Summary

Problems solved by technology

The two-dimensional cooling of the upper part of the crystallizer corner is higher than that of the lower part, and the production cost and design of such a crystallizer are difficult

[0005] In the prior art, there are still many similar continuous casting crystallizers involved in the above-mentioned patented technology. Some crystallizers have industrial application examples, and some have no application examples. The reason is that although the above crystallizers can improve crystallization to a certain extent The heat transfer at the corner of the crystallizer, but it also brings the difficulty of manufacturing and high cost of popularization; at the same time, the wall thickness of the upper corner of some crystallizers is thinner than that of the lower part, which instead causes the enhancement of corner cooling instead of weakening

In the prior art, it is also believed that the two-dimensional heat transfer at the corner of the crystallizer causes severe cooling at the corner, which will immediately cause the billet shell at the corner to separate from the mold wall. Because the thermal resistance of the air gap is too large, the cooling at the corner is weaker than that at the side. , the corner cooling should be enhanced, otherwise it will also cause defects such as non-uniform solidification cracks in the billet shell

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