RU30106U1 - Continuous casting tundish - Google Patents

Abstract

1. An intermediate ladle for continuous casting of metal, including a lined casing with nozzles for supplying gas, a receiving and casting section with outlet cups with a diameter of "d", while the sections are separated by partitions with through channels made in them, located at an angle to the horizontal, characterized in that it is equipped with additional channels with a diameter of 0.2-0.8 d, placed on the sides of each of the partitions in the bottom of the bucket, through channels are placed in each of the partitions in pairs, symmetrically relative but the vertical plane passing through the axis of the nozzles for gas supply and made in the form of truncated cones with bases facing the receiving section, and the central axis of the through channels of each of the partitions form an angle of 30-75 ° between them, while the intersection point of the central the axis of each of the through channels with the corresponding surfaces of the partitions of the receiving section is located from the bottom of the latter at a distance equal to 0.1-0.4 of the height of the capacity of the intermediate bucket. 2. The intermediate ladle according to claim 1, characterized in that the longitudinal central axis of each of the nozzles for supplying gas is located from the adjacent surface of the partition at a distance of 1.5-3.5d.

Description

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Intermediate bucket

The proposed utility model relates to the field of ferrous metallurgy, namely, steelmaking, in particular, to the construction of intermediate ladles and can be used in continuous casting of metals.

The closest to the proposed technical solution in terms of technical nature and the achieved result (prototype), according to the authors, is an intermediate bucket of a two-strand continuous casting machine according to RF patent No. 1790468, class. B22D 11/10, including a lined casing with nozzles for supplying gas, a receiving and filling sections with outlet glasses with a diameter of "d, the sections being separated by partitions with through channels made therein, located at an angle to the horizontal.

A disadvantage of the known technical solution is the low quality of the metal and the low stability of the metal casting process, due to the fact that the holes made in the partitions serve only for supplying the metal to the casting sections and do not contribute to the organization of directional mixing of the metal to provide accelerated ascent of non-metallic inclusions and gases contained in the melt (liquid metal) and subsequent assimilation by their protective slag, and therefore, the required uniformity of the metal in chemical composition and macrostructure of slabs. for continuous casting of metal.

reducing the number of non-metallic inclusions and heterogeneity of the metal. At the same time, it is possible to obtain a technical result such as improving the quality of rolled products, reducing metal losses during emptying of the tundish, reducing rejection of slabs based on non-metallic inclusions, reducing rejects of hot-rolled pickled and cold-rolled products due to the defect “captivity and, as a result, additional profit.

The above disadvantages are eliminated by the fact that the intermediate ladle for continuous casting of metal, including a lined casing with nozzles for supplying gas, receiving and casting sections with outlet glasses with a diameter of "d, while the sections are separated by partitions with through channels made therein, located at an angle to the horizontal, it is equipped with additional channels with a diameter of 0.2 - 0.8d, placed on the sides of each of the partitions in the bottom of the bucket, through channels are placed in each of the partitions in pairs, symmetrically with respect to the vertical plane passing through the axis of the gas nozzles and made in the form of truncated cones with bases facing the receiving section, the central axes of the through channels, each of the partitions, form an angle of 30–75 ° between them, while the intersection point of the central axis of each of the through channels with the corresponding surfaces of the partitions of the receiving section is located from the bottom of the latter at a distance equal to 0.1 - 0.4 of the height of the capacity of the intermediate bucket; and the longitudinal central axis of each of the gas nozzles is located at a distance of 1.5-3.5d from the adjacent surface of the partition.

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A comparative analysis of the proposed technical solution with the prototype shows that the claimed technical solution differs from the known one for its design, namely, that it is equipped with additional channels in the bottom of the bucket, as well as the shape and location of the through channels communicating the receiving and pouring sections. Thus, the claimed technical solution meets the criterion of the utility model “Novelty.

A comparative analysis of the proposed solution, not only with the prototype, but also with other technical solutions, did not reveal the essential features inherent in the claimed solution. It follows that the claimed combination of significant differences provides the above-mentioned technical result.

The proposed technical solution will be clear from the following description and the drawings attached to it:

Figure 1 - schematically shows the proposed

intermediate bucket;

In FIG. 2 - shows a top view of the bucket;

In FIG. 3 - section A-Afig. 1;

In FIG. 4 - section B - B of FIG. 1.

An intermediate ladle for continuous casting of metal includes a lined casing 1 with nozzles 2 for supplying gas, a receiving 3 and 4 casting sections with exhaust cups 5 of diameter d, the sections being separated by partitions 6 with through channels 7 made therein, located at an angle - a - to the horizontal equal to 20 - 60 °. The intermediate bucket is equipped with additional channels 8 with a diameter of 0.2 - 0.8 d, placed on the sides of each of the partitions 6 in the bottom of the bucket. Through channels 7 are placed in each of the partitions 6 in pairs, symmetrically

1 (g relative to the vertical plane - P - passing through the axis of the gas nozzles and made in the form of truncated cones with bases facing the receiving section 3, and a ± de are the central axes 9 of the through channels 7, each of the partitions b ;; h8 --vi form an angle between themselves - (3 - a value equal to 30 - 75 °, while the point of intersection of the central axis 9 of each of the through channels 7 with their corresponding surfaces - B - and - G of the partitions 6 of the receiving section 3 is located from the bottom the latter at a distance of - in - equal to 0.1 - 0.4 height - N capacity between The longitudinal, central axis 10 of each of the nozzles 2 for supplying gas is located from the adjacent surface of the partition 6 at a distance of c- equal to 1.53.5 d. An intermediate ladle for continuous casting of metal works as follows. the ladle (not shown in the figures) enters the receiving section 3 of the intermediate ladle, from there, through the through channels 7 and additional channels 8, to the casting sections 4. Due to the fact that the through channels 7 are located at an angle to each other, the metal flows first enter the inert gas supply zone and then move along the perimeter of the casting sections 4. The inclined arrangement of the through channels gives the metal an additional translational upward movement, which, together with the supplied inert gas, accelerates the ascent of non-metallic inclusions and gases and their subsequent assimilation with protective refining slag which is located on the surface of the metal in the casting sections. All this as a whole helps to improve the quality and uniformity of the cast metal, as well as the process of stabilizing the casting of metal, improving the quality of slabs, and reducing scrap.

Next, the metal from the intermediate ladle is fed through the exhaust glasses 5 into the molds (under the metal level). Continuous casts are drawn from cristallizers. The flow rate from the bucket is regulated by stoppers or slide gate valves (not shown in the figures).

The placement of additional channels on the sides of each of the partitions in the bottom of the bucket can reduce metal loss during emptying of the intermediate bucket. The implementation of additional channels with a diameter of less than 0.2 d is not enough to drain the metal residues due to the high probability of clogging of the hole with underlying metal and slag.

The implementation of additional channels with a diameter of more than 0.8 d leads to the fact that through them there is a flow of non-metallic inclusions from the receiving to the casting sections, which leads to contamination of liquid metal and a decrease in the quality of slabs, which is unacceptable.

The range of values of the position of the point of intersection of the central axis of each of the through channels with the corresponding ones. it surfaces of the walls of the receiving section within 0.1 to 0.4 of the height of the capacity of the intermediate ladle, due to the hydraulic laws of the flow of liquid metal and the distribution of its flows in the Central zone of the bucket. At lower values, the necessary averaging of the metal over the chemical composition and temperature will not be ensured; the rate of removal of gases and non-metallic inclusions from the metal will be insufficient. At large values, the flows of liquid metal will capture particles of non-metallic inclusions from the meniscus of the metal in the tundish, which is unacceptable.

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If the central axes of the through channels, each of the partitions, form an angle of less than 30 ° to each other, then the jets of liquid metal pass by the zone of the nozzles for supplying inert gas, which reduces the efficiency of gas separation from the melt and non-metallic inclusions, which is undesirable.

If the central axes of the through channels, each of the partitions, form an angle of more than 75 ° between themselves, this leads to a collision of the jets of liquid metal and its saturation with non-metallic inclusions, which is unacceptable.

The placement of the longitudinal, central axis of each of the nozzles for supplying gas from the adjacent surface of the partition at a distance equal to 1.5 - 3.5d was determined experimentally.

From this we can conclude that the task whose solution the technical solution is aimed at is fulfilled, while achieving the above technical result is achieved.

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Claims (2)

1. An intermediate ladle for continuous casting of metal, including a lined casing with nozzles for supplying gas, a receiving and casting section with outlet cups with a diameter of "d", while the sections are separated by partitions with through channels made in them, located at an angle to the horizontal, characterized in that it is equipped with additional channels with a diameter of 0.2-0.8 d, placed on the sides of each of the partitions in the bottom of the bucket, through channels are placed in each of the partitions in pairs, symmetrically relative but the vertical plane passing through the axis of the nozzles for gas supply and made in the form of truncated cones with bases facing the receiving section, and the central axis of the through channels of each of the partitions form an angle of 30-75 ° between them, while the intersection point of the central the axis of each of the through channels with the corresponding surfaces of the partitions of the receiving section is located from the bottom of the latter at a distance equal to 0.1-0.4 of the height of the capacity of the intermediate bucket. 2. The intermediate bucket according to claim 1, characterized in that the longitudinal central axis of each of the nozzles for supplying gas is located from the adjacent surface of the partition at a distance equal to 1.5-3.5d.