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Slab submersed nozzle controlling flowing of metal fluid

A metal fluid, immersion technology, used in metal processing equipment, manufacturing tools, casting melt containers, etc., can solve problems such as large liquid level fluctuations, affecting the heat transfer of the billet shell, and uneven heat transfer in the meniscus area. , to achieve the effect of less risk of production accidents, improved product quality, and comprehensive options

Inactive Publication Date: 2014-07-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the flow stream flowing from the submerged nozzle to the narrow face of the slab is too strong, the slab shell on the narrow face will grow unevenly due to the scouring effect, which will affect the heat transfer of the slab shell, resulting in longitudinal cracks at the corners, and even serious cracks. Leakage; at the same time, if the impact angle or other reasons make the momentum of the upward stream along the narrow surface too strong, the liquid level in the meniscus area fluctuates too much, and the liquid slag infiltrates is difficult, resulting in uneven heat transfer in the meniscus area, thus Longitudinal crack
Excessive liquid level fluctuations will also destroy the stable solidification of the meniscus, which may easily cause surface defects such as local slag inclusions and subcutaneous slag inclusions; but if the upper flow is too weak, the surface velocity of the meniscus area of ​​the mold will be too small or the molten steel will The update is too slow, resulting in low temperature of molten steel in this area, resulting in local condensation to form deep vibration marks and the primary billet shell in the meniscus area is in the shape of a "hook", which will capture slag droplets, inclusions and air bubbles into the solidified billet shell
On the contrary, too strong downward flow is not conducive to the floating of inclusions and air bubbles, and it is easy to cause internal or central defects of the slab
In conclusion, the formation of slab defects is closely related to the flow behavior of molten steel in the mold.

Method used

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  • Slab submersed nozzle controlling flowing of metal fluid
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  • Slab submersed nozzle controlling flowing of metal fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] like figure 2 As shown, the flow control pyramid 3 is to place a side length L in the bottom groove 1 40mm, height H 1 It is a 70mm square pyramid, in which the two corners of the pyramid are aligned with the center line of the metal liquid spit hole on the side of the nozzle. In order to ensure the symmetry of the flow inside the nozzle, the prisms on both sides are completely symmetrical along the two diagonal lines perpendicular to each other. When the above conditions are determined, change the angle α between the two sides of the bottom of the edge 1 When changing from 5° to 45°, the shape of the pyramid will change accordingly, and at the same time, the angle of the reflecting surface of the incident stream will also change, so that after the incident stream is reflected by the pyramid, the original flow state will be changed, resulting in a After the nozzle, flow fields of different shapes are formed in the crystallizer. Changing the length L of the base and...

Embodiment 2

[0033] like image 3 As shown, the flow control pyramid 3 is to place a height H in the bottom groove 1 is 70mm, and the side lengths are L 1 It is a 40mm square pyramid, in which the two corners of the pyramid are aligned with the center line of the metal liquid spit hole on the side of the nozzle. The quadrangular pyramid is completely symmetrical along the center plane of the outlet and its vertical plane. On the four faces of the pyramid, add an inverted V-shaped boss respectively, the height of the bottom surface h 1 is 30mm, and the angle between the two bottom edges is β 1 is 60°. When the above conditions are determined, change the angle α between the two sides of the bottom of the edge 1 When changing from 5° to 60°, the shape of the pyramid will change accordingly, and the angle of the reflecting surface of the incident stream will also change, so that after the incident stream is reflected by the pyramid, the original speed and direction will be changed, thereb...

Embodiment 3

[0035] like Figure 4 As shown, the flow control pyramid 3 is to place a side length L in the bottom groove 1 40mm, height H 1 It is a 70mm square pyramid, and engraved on the four sides of the square pyramid with a radius r of 15mm and a chord height of h 2 10mm circular launder. Wherein the two corners of the pyramid are centered with the center line of the metal liquid spit hole on the side of the nozzle. In order to ensure the symmetry of the flow inside the nozzle, the prisms on both sides are completely symmetrical along the two diagonal lines perpendicular to each other. In this case, the inner diameter of the nozzle Φ, the depth of the closed concave bottom H, and the length of the bottom edge L 1 , Pyramid height H 1 , the angle α between the two sides of the base 1 , launder radius r, chord height h 2 For the control factors, changing one of the factors can cause the flow control boss to change, thereby producing different metal fluid outlet states and differe...

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Abstract

The invention discloses a slab submersed nozzle controlling flowing of metal fluid. The slab submersed nozzle comprises a fire-resistant material pipe, metal liquid outlets and a flow control pyramid; the fire-resistant material pipe is cylindrical, the upper end of the fire-resistant material pipe is open, the bottom end of the fire-resistant material pipe is sealed, the left and the right of the position, having a certain distance from the bottom, on the side face of the fire-resistant material pipe are symmetrically provided with the two metal liquid outlets, and the flow control pyramid is arranged in a bottom groove of the fire-resistant material pipe; by reasonably combining different groove depths, different corner angle numbers of the flow control pyramid, the height of the flow control pyramid, the bottom edge length of the flow control pyramid, the included angel between bottom edges, and shapes of flow grooves formed in the pyramid surfaces, flowing of the metal liquid discharged through the metal liquid outlets is regulated, different flowing states are obtained, and therefore molten pool and liquid surface fluctuation conditions in a crystallizer are effectively controlled.

Description

technical field [0001] The invention relates to a slab submerged nozzle for controlling the flow of metal fluid, belonging to the technical field of metallurgical continuous casting equipment. Background technique [0002] The continuous casting mold is an important link to improve the output and quality of steel. During the continuous casting process, the behavior of the molten steel in the mold has a decisive influence on the quality of the slab. Usually, the molten steel enters the mold from the tundish through the submerged nozzle, and completes the initial solidification process in the mold to form a solidified shell with a certain thickness. Since the high-temperature molten steel entering the mold has a large kinetic energy, it has an important impact on slag entrainment, solidification heat transfer, temperature field distribution in the mold, and solidification shell thickness distribution, which ultimately affects the quality of the continuous casting slab. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/50
Inventor 张捷宇徐钧王波冯孔方白亮
Owner SHANGHAI UNIV
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