RU2189292C1 - Intermediate ladle for steel continuous casting plant - Google Patents

Abstract

FIELD: metallurgy, possibly metal continuous casting. SUBSTANCE: intermediate ladle includes partitions dividing working cavity by receiving and pouring sections mutually communicated through openings of partitions; bottom having openings for supplying steel into mold. There are lips in front of openings for supplying steel to mold. Said lips provide uprising metal flow at casting process. It provides more intensified assimilation of non-metallic inclusions by means of slag. Openings made in lower portions of partitions allow to uniformly distribute metal along bottom of ladle in order to lower intensified oxidation of supplied metal. EFFECT: significantly reduced influence of metal flow upon stopper due to arrangement of openings along edges of partitions. 2 dwg

Description

 The invention relates to ferrous metallurgy, specifically to continuous casting of metals.

 Known intermediate bucket (AS 1631820), equipped with four thresholds of different heights. Thresholds divide the working cavity of the bucket into the receiving, intermediate and casting parts. The disadvantage of this design is the unsatisfactory quality of continuously cast ingots.

 Known intermediate bucket ("Collection of works of TsLK 1", Magnitogorsk, 1997, S. 234), equipped with two partitions that divide the working cavity of the bucket into the receiving and casting parts. The bottom of the receiving part is located above the bottom of the casting parts. In the center of the dividing partitions, nine holes for storing metal from the receiving part to the casting are staggered. The disadvantages of this device are the unsatisfactory quality of continuously cast ingots and the low durability of the bucket.

 The closest analogue to the proposed device is an intermediate ladle for continuous casting of steel (patent US 4852632 B 22 D 11/10, 08/01/1989), containing four partitions dividing the working cavity of the ladle into the receiving and casting parts, the bottom in which holes are made for supply of steel to the mold. The receiving and pouring parts of the bucket communicate with each other by means of holes made in the lower parts of the partitions.

 The disadvantages of this device are the unsatisfactory quality of continuously cast ingots and the low durability of the bucket.

 The present invention solves the problem of improving the quality of continuously cast ingots and increasing the durability of the intermediate bucket of the bucket cavity of the assembly, which would create directed metal flows that facilitate the transition of non-metallic inclusions to slag.

 The closest analogue to the proposed device is the intermediate ladle ("Collection of works of TsLK 1", Magnitogorsk, 1997, p.234), equipped with two partitions that separate the working cavity of the ladle into the receiving and casting parts. The bottom of the receiving part is located above the bottom of the casting parts. In the center of the dividing partitions, nine holes for storing metal from the receiving part to the casting are staggered. The disadvantages of this device are the unsatisfactory quality of continuously cast ingots and the low durability of the bucket. The unsatisfactory quality of the ingots is explained by the lack of protection of the metal from intensive oxidation at the beginning of casting and the ingress of slag through openings from the inlet to the casting parts with a decrease in the level of metal in the ladle. The low durability of the bucket is due to the fact that when the metal level is reduced, the holes in the partitions are drawn in by the slag, which significantly complicates the flow of metal into the casting parts, and the ingress of slag from the receiving part into the casting parts leads to the fact that the slag formed after mixing quickly crystallizes and impedes the stopper. All this leads to the need to replace the bucket and reduce the number of heats cast through the intermediate bucket.

 The present invention solves the problem of improving the quality of continuously cast ingots and increasing the durability of the tundish.

 To achieve the specified technical result, in the proposed intermediate ladle of a continuous metal casting installation containing a working cavity, divided by partitions into a receiving and casting parts communicating with each other by holes in the partitions, thresholds are set in front of the holes for supplying metal to the mold, and holes for the passage of metal from the receiving to the pouring parts are made along the edges in the lower part of the separation walls, and the height of the holes should not exceed the height of the level the minimum amount of metal in the tundish, to ensure continuous casting process.

 The invention is illustrated by drawings, where in FIG. 1 shows a sectional construction of an intermediate bucket, in FIG. 2 is a cross-sectional view of a partition wall of an intermediate bucket.

 In the working cavity 1 of the intermediate bucket, partitions 2 are made, dividing the working cavity 1 of the bucket into the receiving 3 and pouring 4 parts. The receiving 3 and casting 4 parts communicate with each other through holes 5 made at the edges in the lower part of the partitions 2. In the casting parts there are holes 6 for supplying metal to the mold. On the bottom 7 in the casting parts 4, in front of the holes 6 for supplying metal to the mold, there are thresholds 8. The intermediate ladle operates as follows.

 At the beginning of the casting, liquid metal, for example steel, is fed from the casting ladle to the receiving part 3 of the working cavity of the intermediate ladle, from where it flows through the holes 5 in the partitions 2 into the casting parts 4. Holes 5 in the partitions 2 allow the metal to be distributed along the bottom 7 of the ladle without formation jet fall on the first heat, which leads to less intense oxidation of the incoming metal. Due to the fact that the holes 5 are not located in the center, but along the edges in the lower part of the partitions 2, the degree of influence of the metal flow on the stopper is significantly reduced, which increases its resistance. The height of the holes 5 should not exceed the height of the level of the minimum amount of metal in the tundish necessary to ensure the continuity of the casting process. Such a height of the holes 5 will prevent them from being drawn in by the slag and the slag from the receiving part 3 into the casting 4, as a result of which the number of heats cast through one intermediate ladle increases.

 Then the liquid metal through the thresholds 8 enters further into the casting part 4 of the intermediate ladle. In this case, the first portion of the "cold" metal remains behind thresholds 8 and then the "hot" metal enters, thereby stabilizing the start of casting. Thresholds 8 also create an upward flow of metal, which leads to more intensive assimilation by the slag of non-metallic inclusions in the casting parts 4 of the intermediate ladle. The height of the thresholds 8, it is advisable to choose no more than the height of the level of the minimum amount of metal in the tundish necessary to ensure the continuity of the casting process. In this case, at the end of casting and a decrease in the level of metal in the ladle, the remaining metal will not exceed the normal value.

Claims (1)

 An intermediate ladle of a continuous steel casting installation, containing partitions separating the working cavity into the receiving and casting parts, communicating with each other using holes made in the lower parts of the partitions, a bottom in which holes are made for supplying steel to the mold, characterized in that it is provided thresholds installed in front of the holes for supplying steel to the mold, and the holes in the partitions are made at the edges.

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