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Tundish flow control device for slab casting machine, preparation method thereof and slagging method using tundish flow control device

A slab continuous casting machine and tundish technology, applied in casting equipment, mechanical cleaning, manufacturing tools, etc., can solve the problems of prolonging the residence time of molten steel, increasing the amount of tundish injection, and unable to discharge steel slag regularly.

Active Publication Date: 2012-10-24
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, after the flow control device is installed in the tundish of the slab continuous casting machine, there are new technical problems: (1) The slag retaining weir is installed, and the steel slag floating in the tundish cannot be discharged regularly through the tundish overflow port. It can shorten the continuous pouring time of the tundish, resulting in an increase in the production cost of continuous casting; (2) Set up a slag dam to block part of the molten steel from flowing out after the tundish stops pouring, thereby increasing the excess of the tundish and reducing the slab (3) The flow control device is not resistant to erosion and erosion, and its service life is low, which has become a bottleneck problem that restricts the improvement of the life of the slab continuous casting tundish, resulting in an increase in continuous casting production costs
In this invention, the upper edge of the slag retaining weir is flush with the edge of the tundish, and the steel slag floating in the tundish cannot be discharged regularly through the tundish overflow port, and the continuous pouring time of the tundish can only be shortened; the slag retaining dam There is no through hole on the top, and after the tundish stops pouring, part of the molten steel is blocked from flowing out, thereby increasing the tundish injection surplus; the slag retaining weir adopts the existing production technology, and its resistance to molten steel erosion and erosion is poor; The bottom part of the flow impact adopts the traditional impact pad (11), without a turbulence controller, which greatly weakens the effect of prolonging the residence time of molten steel in the tundish and promoting the floating and removal of inclusions, and the impact pad resists the erosion and erosion of molten steel poor performance

Method used

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  • Tundish flow control device for slab casting machine, preparation method thereof and slagging method using tundish flow control device
  • Tundish flow control device for slab casting machine, preparation method thereof and slagging method using tundish flow control device
  • Tundish flow control device for slab casting machine, preparation method thereof and slagging method using tundish flow control device

Examples

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Embodiment 1

[0052] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, a tundish flow control device for a slab continuous casting machine includes a turbulence controller 4, a slag retaining weir, and a slag retaining dam. Line coincides with the center line of the long nozzle of the ladle, the slag retaining weir is fixed on the working lining of the tundish wall, the slag retaining dam is fixed on the working lining of the tundish bottom, and the upper edge of the slag retaining weir 5 is higher than the normal pouring of the tundish The distance n of the highest liquid steel level 10 of the molten steel is 50 mm, and the distance m between the upper edge of the slag retaining weir 5 and the working surface of the smear material 1 of the tundish overflow port is 50 mm, and the slag retaining weir 5 and the slag retaining dam 6 are arranged alternately up and down The height x is 100mm, and there is a through hole at both ends of the slag retaining dam 6, the position of th...

Embodiment 2

[0063] A preparation method of the turbulence controller 4 as described in embodiment 1, comprising the following steps:

[0064] 1) Preparation of the turbulence controller housing 14. After weighing the constituent materials of the castable of the turbulence controller housing 14, add them into the mixer for dry mixing for 2 minutes, add 4.5% of the total weight of the materials in water, and wet mix for 6 minutes. After mixing, put it into the tire mold and vibrate it with a vibrating rod. When no large air bubbles emerge, the green body of the turbulence controller shell 14 is poured. Firing process: ①Raise the temperature from 0~135±15℃ at a heating rate of 10℃ / h to 135±15℃; ②keep at 135±15℃ for 12 hours; / h heating rate to 275±15℃; ④ heat preservation at 275±15℃, holding time 8h; 435±15°C heat preservation, heat preservation time 8h; ⑦ cease fire and natural cooling, cooling time 12h, the turbulence controller shell 14 is completed.

[0065] 2) Preparation of the turbu...

Embodiment 3

[0071] A slagging method utilizing the flow control device of the tundish of the slab continuous casting machine as described in embodiment 1, comprising the following steps:

[0072] 1) During normal production of continuous casting, the molten steel liquid level in the tundish is controlled below the maximum liquid steel level of the tundish normally poured by 10, and the upper edge of the slag retaining weir 5 is higher than the distance n of the maximum liquid steel level of the tundish normally poured by 10 50mm;

[0073] 2) When the tundish is discharging slag, raise the molten steel level in the tundish to the molten steel level 11 when the tundish is discharging slag, so that the distance z above the working surface of the coating material 1 at the overflow port of the tundish is 50mm. The steel slag in the ladle is discharged through the overflow port 2 of the tundish;

[0074] 3) After the tundish slag discharge is completed, lower the molten steel level in the tund...

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Abstract

The invention relates to a tundish flow control device for a slab casting machine, a preparation method of the tundish flow control device and a slagging method using the tundish flow control device, and belongs to the technical field of the ferrous metallurgy slab casting tundish technology. The tundish flow control device for the slab casting machine comprises a turbulence controller, a slag blockage weir and a slag blockage dam, and is characterized in that the upper edge of the slag blockage weir (5) is higher than the highest liquid level (10) of molten steel normally poured by the tundish, but is lower than the working face of tundish overflow port coating (1); the slag blockage weir (5) and the slag blockage dam (6) are vertically staggered; two ends of the slag blockage dam (6) are respectively provided with a through hole; a center distance a between the slag blockage weir (5) and the turbulence controller (4) is 400-600mm; and a center distance b between the slag blockage weir (5) and the slag blockage dam (6) is 300-400mm. After the tundish flow control device for the slab casting machine is adopted, slab tundish injection residue can be reduced by more than 25%, the service life of the flow control device is improved by one time and is above 14 hours, and the production cost of continuous casting refractory material is lowered by more than 30%.

Description

technical field [0001] The invention relates to a flow control device for a tundish of a slab continuous casting machine, a preparation method thereof and a method for discharging slag using the same, and belongs to the technical field of iron and steel metallurgy slab continuous casting tundish technology. Background technique [0002] A flow control device is installed in the tundish of the slab continuous casting machine to change the running route of molten steel, prolong the residence time of molten steel in the tundish, and has the metallurgical function of promoting the floating and removal of inclusions, reducing inclusions inside the slab, and changing the shape of inclusions . The flow control device is generally composed of a turbulence controller, a slag retaining weir, and a slag retaining dam. At present, after the flow control device is installed in the tundish of the slab continuous casting machine, there are new technical problems: (1) The slag retaining we...

Claims

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Application Information

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IPC IPC(8): B22D41/00B22D41/44B22D43/00
Inventor 李洪建武光君郭伟达张佩
Owner LAIWU IRON & STEEL GRP
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