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A continuous casting tundish breathable upper nozzle seat brick and its installation method

A technology for continuous casting tundish and nozzle seat bricks, which is applied in casting equipment, casting molten material containers, metal processing equipment, etc., and can solve problems such as poor production and application effects, no capture, removal of inclusions, and increased resistance, and achieve Facilitates flotation and removal, eases over-eye problems, and eases the installation process

Active Publication Date: 2016-04-20
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The converter tapping air curtain slag blocking device is used as a device for "pneumatic slag blocking" in the converter tapping slag blocking process, and has the following technical defects: the air curtain formed by argon passing through the device is used to remove the The steel slag is blocked in the converter, without the function of capturing and removing inclusions, the success rate of slag blocking is low, the ring seam is easy to penetrate steel and block, and the production and application effect is poor
[0007] However, the above two patents still have the following disadvantages: the refractory body (1) has poor resistance to high-temperature molten steel erosion and erosion, resulting in an increase in the design height of the breathable ceramic rod or wall (2), allowing argon to pass through the breathable ceramic rod or breathable wall. The resistance of the wall (2) increases, and the density of the formed argon bubbles decreases, thereby reducing the ability of the argon bubbles to capture and remove inclusions, resulting in ineffective removal of inclusions in actual production

Method used

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  • A continuous casting tundish breathable upper nozzle seat brick and its installation method
  • A continuous casting tundish breathable upper nozzle seat brick and its installation method
  • A continuous casting tundish breathable upper nozzle seat brick and its installation method

Examples

Experimental program
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Effect test

Embodiment 1

[0057] A continuous casting tundish breathable upper nozzle seat brick, such as figure 1 , figure 2 , image 3 As shown, including the upper nozzle block body 3, the upper nozzle block body 3 is casted with corundum castable, the refractoriness of the corundum castable is ≥1790°C, and the bulk density is ≥2.9g / cm 3 , normal temperature compressive strength ≥ 80Mpa, Al in corundum castable 2 o 3 Content ≥ 93%, the middle part of the upper nozzle block body is provided with an upper nozzle installation hole that penetrates up and down, and the upper nozzle block body 3 is provided with a circular breathable ring 1 and an annular air chamber box 2, the air chamber box 2 Located at the bottom of the breathable ring 1 and communicated with the breathable ring 1, the bottom of the air chamber box 2 is connected with an air intake pipe 4, and the upper nozzle block body 3 includes an integrally formed upper boss and a lower boss, and the outer diameter of the lower boss is less t...

Embodiment 2

[0060] The continuous casting tundish breathable upper nozzle block as described in Example 1, the difference lies in:

[0061] The upper ring width a of the breathable ring 1 is 25 mm, the lower ring width b is 7 mm larger than the upper ring width a, and the height H of the breathable ring 1 is 90 mm.

[0062] The air chamber box 2 is circular as a whole, and the inner air chamber is integrally formed by a metal box. The cross section of the metal box is rectangular, the width m of the rectangle is 35mm, and the height n is 20mm.

[0063] The outer diameter D of the upper boss of the upper nozzle block body 3 is 380mm, the outer diameter d of the lower boss is 300mm, and the height h of the lower boss is 100mm. The upper end of the boss on the upper nozzle block body 3 is 10mm higher than the upper surface Z of the working lining 15 at the bottom of the tundish.

Embodiment 3

[0065] The continuous casting tundish breathable upper nozzle block as described in Example 1, the difference lies in:

[0066] The upper ring width a of the breathable ring 1 is 23 mm, the lower ring width b is 6 mm larger than the upper ring width a, and the height H of the breathable ring 1 is 75 mm.

[0067] The air chamber box 2 is in the shape of a ring as a whole, and the inner air chamber is formed integrally with a metal box. The cross section of the metal box is rectangular, the width m of the rectangle is 30mm, and the height n is 18mm.

[0068]The outer diameter D of the upper boss of the upper nozzle block body 3 is 370 mm, the outer diameter d of the lower boss is 290 mm, and the height h of the lower boss is 120 mm. The upper end of the boss on the upper nozzle block body 3 is 8mm higher than the upper surface Z of the working lining 15 at the bottom of the tundish.

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Abstract

The invention relates to a breathable upper pocket block of a continuously-cast intermediate ladle and an installation method thereof. The breathable upper pocket block comprises an upper pocket block body, wherein the upper pocket block body comprises an upper boss and a lower boss which are integrally formed; the outer diameter of the lower boss is less than that of the upper boss; a breathable ring and an air chamber are positioned in the upper boss of the upper pocket block body; The circular ring width of the breathable ring is gradually reduced from bottom to top; an air inlet pipe is L-shaped; after argon gas is blown in, an annular air curtain barrier is formed around an upper pocket, air washing is performed on molten steel which is about to enter into the upper pocket, floating and removal of impurities are promoted, meanwhile the problem of sleeve holes caused by the impurities attached to the inner wall of the upper pocket of the intermediate ladle in the process of producing low-carbon aluminum killed steel by virtue of a slab caster is reduced, the continuous casting furnace quantity of the intermediate ladle is improved, the continuous casting furnace quantity is improved from 6-8 to 10-12, and the continuous casting refractory material cost is proportionally reduced by more than 40%.

Description

technical field [0001] The invention relates to a continuous casting tundish breathable upper nozzle seat brick and an installation method thereof, belonging to the technical field of continuous casting technology in iron and steel metallurgy. Background technique [0002] When the slab continuous casting machine produces low-carbon aluminum-killed steel grades, due to Al in molten steel 2 o 3 If there are many inclusions, it is easy to cause the upper nozzle of the tundish or the submerged nozzle to be holed, and even blockage in severe cases. The submerged nozzle can be replaced online after being holed, but the tundish upper nozzle cannot be replaced online after being holed, making the continuous casting machine The pouring was forced to stop, so the problem of the tundish upper nozzle hole is the main problem that restricts the increase in the number of continuous casting furnaces in the continuous casting tundish. At the same time, the inclusions in the molten steel h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/50
Inventor 武光君
Owner LAIWU IRON & STEEL GRP
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