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A tundish working layer lining structure for absorbing inclusions in molten steel

A technology of tundish and working layer, which is applied in the direction of manufacturing tools, metal processing equipment, casting melt containers, etc., can solve the problems of volume expansion, hydrogenation of molten steel, easy hydration, etc., so as to improve service life and prevent water absorption and dehydration , the effect of high reactivity

Active Publication Date: 2019-04-23
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the use of the working layer of CaO refractory materials in the tundish, a technical bottleneck is the easy hydration of CaO. Water absorption by CaO will cause volume expansion and cause cracks in the working layer of CaO refractory materials in the tundish. hydrogenation of molten steel

Method used

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  • A tundish working layer lining structure for absorbing inclusions in molten steel
  • A tundish working layer lining structure for absorbing inclusions in molten steel

Examples

Experimental program
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Effect test

Embodiment 1

[0036] make one such as figure 1In the tundish shown, a layer of tundish working liner 12 with a thickness of about 22 mm is poured on the permanent layer 11 of the tundish with MgO dry material, molded by tire membrane vibration, and baked at a temperature of 200°C 4 hours, take off the membrane and set aside.

[0037] Within the area of ​​100mm outside the installation position of the nozzle 4, retaining wall 7 and retaining dam 5 of the tundish, use MgO dry material on the working lining layer of the tundish to form a 20mm thick working lining surface layer (corresponding to For the working lining surface layer 9 of the nozzle, the working lining surface layer 8 of the retaining wall and the working lining surface layer 6 of the retaining dam, to facilitate the later installation of the nozzle, retaining wall and retaining dam, the slag line and the bag edge are rammed with MgO dry material A 20mm thick MgO working lining surface layer 1 is formed to achieve the effect of ...

Embodiment 2

[0044] make one such as figure 1 In the tundish shown, a layer of tundish working liner 12 with a thickness of about 25 mm is poured on the permanent layer 11 of the tundish with MgO-based dry castable material, formed by vibrating tire membranes, and baked at a temperature of 400°C Bake for 2 hours, remove the film and set aside.

[0045] Within the area of ​​150 mm around the installation position of the tundish nozzle 4, retaining wall 7 and retaining dam 5, use MgO dry material to pound into a 15 mm thick working lining surface layer (corresponding to the nozzle working lining surface layer 9 and retaining wall working lining surface layer respectively). The surface layer 8 and the working lining surface layer 6) of the retaining dam are convenient for the post-installation of the nozzle, the retaining wall and the retaining dam. The slag line and the bag edge are pounded into a 15mm thick MgO working lining surface layer 1 with MgO dry material at the position of the slag...

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Abstract

The invention belongs to the technical field of ferrous metallurgy and particularly relates to a tundish working layer lining structure for adsorbing inclusions in molten steel. A working lining layer which is formed by casting a MgO-based dry material and is about 22-25 mm thick is contained in the tundish working layer lining provided by the invention, the effect as a refractory material is achieved, a tundish permanent layer is protected, the effect of preventing adhesion between the calcium and magnesium refractory material on the surface of the working lining and the tundish permanent layer is achieved, a tundish is prone to overturning after being unloaded, the refractory material on the working lining can be removed conveniently, and the tundish is rebuilt. The tundish working layer lining provided by the invention contains the working lining surface layer formed by ramming the calcium and magnesium refractory material containing 70-80wt% of CaO, the reaction activity between CaO and the inclusions is high, the performance of adsorbing the inclusions is excellent, high-melting-point phases are generated after the MgO reacts with the inclusions, the corrosion resistance of the working lining can be improved, and the service life of the working lining can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular, the invention relates to a working layer lining structure of a tundish for absorbing inclusions in molten steel. Background technique [0002] With the rapid development of the economy, customers have higher and higher requirements for steel quality, and iron and steel enterprises are also conducting more and more in-depth research on the technology of removing inclusions in molten steel. The tundish is a refractory container used in short-process steelmaking. It first receives the molten steel poured from the ladle, and then distributes it to each crystallizer through the tundish nozzle. Molten steel generally stays in the tundish for 5 to 12 minutes. In high-efficiency continuous steelmaking production, this period of time is very precious. Making full use of the residence time of molten steel in the tundish to further purify the molten steel can significantly i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/02C04B35/66B22D1/00
CPCB22D1/00B22D41/02C04B35/66
Inventor 刘洪银孙建卫杨波王孝科郝帅路峰袁鹏举亓伟伟王奉县倪培亮
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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