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A long nozzle sealing ring

A sealing ring and shroud technology, which is applied in metal processing equipment, manufacturing tools, casting melt containers, etc., can solve the problems of fiber sealing ring surface roughness, fiber structure damage and brittleness, and easy to become fine powder, etc., to achieve The effect of smooth surface, less breakage and less fracture

Active Publication Date: 2020-06-19
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of ladle changing, the ladle nozzle can easily break the fiber sealing ring when it falls, so that a small gap is easily formed between the nozzle and the long nozzle, and air is sucked in when pouring steel at high speed, polluting the molten steel
[0003] Moreover, the surface of the traditional fiber sealing ring is relatively rough, and it is easy to produce gaps between it and the nozzle, resulting in poor sealing, which will seriously affect the internal quality of the billet
[0004] The patent application number is 200920074923.6, which discloses a new type of continuous casting shroud seal. The ordinary aluminum silicate fiber is used as the fiber blanket. However, in actual production, the fiber is overheated, and the structural water is precipitated, and the fiber structure will be destroyed. Brittle, if added with friction and kneading, it is easy to become fine powder, and the sealing effect is not stable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, the substrate of the shroud sealing ring is made of zirconium-containing aluminum silicate fiber material, and the composition of the zirconium-containing aluminum silicate fiber material contains 59.6% Al in mass percent 2 o 3 , 25% SiO 2 , 0.2% Fe 2 o 3 , 0.2% Li 2 O, 5% Si 3 N 4 and 10% ZrO 2 . The matrix made of this proportioned fiber material is exposed to a high temperature environment of 1500°C for 6 hours. During this process, the matrix first expands and expands in volume, and as part of the material in the material is oxidized at high temperature, its volume will gradually shrink. Finally, it is verified that its thermal expansion rate is - 4.5-4.5%. The actual stable use temperature that can be achieved is 1300℃~1350℃. The surface of the matrix is ​​smooth, the fiber structure is stable at high temperature, the elongation at break is 0.6%, and the matrix is ​​not easy to crack. In order to have better sealing performance during assemb...

Embodiment 2

[0022] Embodiment 2, the matrix of the shroud sealing ring is also made of zirconium-containing aluminum silicate fiber material, and the composition of the zirconium-containing aluminum silicate fiber material contains 60% Al by mass percentage. 2 o 3 , 21.6% SiO 2 , 0.1% Fe 2 o 3 , 0.3% Li 2 O, 7% Si 3 N 4 and 11% ZrO 2 . Similarly, the matrix made of this proportioned fiber material was placed in a high-temperature environment of 1500°C for 6 hours. During this process, the matrix first expands and expands in volume, and as part of the material in the material is oxidized at high temperature, its volume will gradually shrink. Finally, it is verified that its thermal expansion rate is -4.2 to 4.2%. The actual stable use temperature that can be achieved is 1320 ° C ~ 1360 ° C. The surface of the matrix is ​​smooth, the fiber structure is stable at high temperature, the elongation at break is 0.6%, and the matrix is ​​not easy to crack. In order to have better sealin...

Embodiment 3

[0023] Embodiment three, the composition of the zirconium-containing aluminum silicate fiber material of the matrix contains 58.65% Al by mass percentage 2 o 3 , 20% SiO 2 , 0.35% Li 2 O, 8% Si 3 N 4 and 13% ZrO 2 . Similarly, the matrix made of this proportioned fiber material was placed in a high-temperature environment of 1500°C for 6 hours. During this process, the matrix first expands and expands in volume, and as part of the material in the material is oxidized at high temperature, its volume will gradually shrink. Finally, it is verified that its thermal expansion rate is -4.0 to 4.0%. The actual stable use temperature that can be achieved is 1330 ° C ~ 1370 ° C. The surface of the matrix is ​​smooth, the fiber structure is stable at high temperature, the elongation at break is 0.6%, and the matrix is ​​not easy to crack. In order to have better sealing performance during assembly, a thin layer of graphite is also coated on the inner and outer surfaces of the su...

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Abstract

The invention discloses a sealing ring of a long nozzle. The sealing ring comprises a base body, wherein the base body is made of a zirconium-containing type aluminum silicate fiber material. The basebody comprises a sealing portion and a sealing cap edge. The sealing portion is in an inverted circular truncated cone shape and is through in the up-and-down direction. The sealing cap edge is outwards bent from the upper edge of the sealing portion and horizontally extends out. A plurality of circular holes are uniformly formed in the circumferential direction of the sealing portion and penetrate through the sealing portion. The zirconium-containing type aluminum silicate fiber material comprises, by mass percentage, 50%-60% ofAl2O3, 20%-25% of SiO2, smaller than or equal to 0.2% of Fe2O3,0.2%-0.5% of LiO2, 5%-10% of Si3N4 and 10%-18% of ZrO2. The sealing ring of the long nozzle can overcome the limits in the prior art, the frequency of the phenomena that due to the fact that sealing is poor, the gas content of molten steel is increased, and the inclusion is enlarged can be effectively reduced, and the phenomenon that due to the fact that the molten steel makes contact with the airto cause secondary pollution, the quality of a casting blank is affected is effectively avoided.

Description

technical field [0001] The invention relates to continuous casting equipment, in particular to a shroud sealing ring. Background technique [0002] In the continuous casting process, protective pouring is very important to improve the cleanliness of molten steel. During the ladle changing process, the ladle nozzle is easy to break the fiber sealing ring when it falls, so that a small gap is easily formed between the nozzle and the long nozzle, and air is sucked in during high-speed steel pouring, polluting the molten steel. [0003] Moreover, the surface of the traditional fiber sealing ring is relatively rough, and gaps are likely to be formed between the nozzle and the nozzle, resulting in poor sealing, which will seriously affect the internal quality of the billet. [0004] The patent application number is 200920074923.6, which discloses a new type of continuous casting shroud seal. The ordinary aluminum silicate fiber is used as the fiber blanket. However, in actual pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/50
CPCB22D41/502
Inventor 李明
Owner NANJING IRON & STEEL CO LTD
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