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Magnesia-zirconia eutectic side hole material for submersed nozzle

An immersion and nozzle technology, applied in the field of refractory materials, can solve the problems of easy fracture of cord steel and brittle inclusions of aluminum, and achieve the effect of high mechanical strength, not easy to break, and prolong service life

Active Publication Date: 2017-02-15
北京利尔高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of material is also easy to cause the fatal defect of introducing aluminum brittle inclusions into the molten steel, resulting in the phenomenon that the cord steel billet produced is easy to break during the wire drawing process, and it is difficult to fully meet the standards of steel companies to produce cord steel with higher cleanliness Require

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A magnesium-zirconium eutectic side hole material for a submerged nozzle, including the following raw materials in mass percentage: 13.6kg of magnesium-zirconium sand, 5.4kg of graphite powder with a carbon content > 99.9%, 0.6kg of fused silica powder, 0.2kg of elemental silicon powder, Silicon carbide powder 0.8kg, boron carbide powder 0.1kg, powdered phenolic resin 0.3kg, liquid phenolic resin 1.6kg.

[0027] The above raw materials are all proportioned according to the required particle size. The particle size of magnesia-zirconium sand is 1-0.5mm, 0.5-0.2mm, and 200 mesh. The weight ratio of the above three kinds is 1:3.5:2.5; the chemical composition of magnesia-zirconium sand used is: MgO 98%, ZrO 2 2%; the particle size of graphite powder is 80 mesh and 100 mesh, and the weight ratio of the above two kinds is 1:1.5; the particle size of boron carbide powder and silicon carbide powder are both 325 mesh; the temperature of liquid phenolic resin is controlled at 15...

Embodiment 2

[0031] The magnesium-zirconium eutectic side hole material of the submerged nozzle in this embodiment, the selected raw materials and the mass percentage of the raw materials are the same as those in Embodiment 1.

[0032] The above raw materials are all proportioned according to the required particle size. The particle size of magnesia-zirconium sand is 1-0.5mm, 0.5-0.2mm, and 200 mesh. The weight ratio of the above three kinds is 1:3.5:2.5; the chemical composition of magnesia-zirconium sand used is: MgO 96%, ZrO 2 4%; the particle size of graphite powder is 80 mesh and 100 mesh, and the weight ratio of the above two kinds is 1:1.5; the particle size of boron carbide powder and silicon carbide powder are both 325 mesh; the temperature of liquid phenolic resin is controlled at 15°C, and the viscosity is not lower than 1200MPa·s.

[0033] The preparation process and conditions of using the above raw materials to prepare the submerged nozzle are the same as those in Example 1....

Embodiment 3

[0036] The magnesium-zirconium eutectic side hole material of the submerged nozzle in this embodiment, the selected raw materials and the mass percentage of the raw materials are the same as those in Embodiment 1.

[0037] The above raw materials are all proportioned according to the required particle size. The particle size of magnesia-zirconium sand is 1-0.5mm, 0.5-0.2mm, and 200 mesh. The weight ratio of the above three kinds is 1:3.5:2.5; the chemical composition of magnesia-zirconium sand used is: MgO 94%, ZrO 2 6%; the particle size of graphite powder is 80 mesh and 100 mesh, and the weight ratio of the above two kinds is 1:1.5; the particle size of boron carbide powder and silicon carbide powder are both 325 mesh; the temperature of liquid phenolic resin is controlled at 15°C, and the viscosity is not lower than 1200MPa·s.

[0038] The preparation process and conditions of using the above raw materials to prepare the submerged nozzle are the same as those in Example 1....

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Abstract

The invention discloses a magnesia-zirconia eutectic side hole material for a submersed nozzle. The magnesia-zirconia eutectic side hole material is prepared from the raw materials of magnesia-zirconia powder, graphite powder, fused silica powder, monatomic silicon powder, silicon carbide powder, boron carbide powder, powdered resin and liquid resin, wherein the granularity of the magnesia-zirconia powder is not greater than 1mm; the magnesia-zirconia powder is prepared from 94 to 98 percent of MgO and 2 to 6 percent of ZrO2; the granularity of the graphite powder is not greater than 100 meshes. The magnesia-zirconia eutectic side hole material provided by the invention has relatively high resistance to oxidation, high thermal shock resistance, high anti-erosion property and resistance to slag corrosion; the submersed nozzle made of the magnesia-zirconia eutectic side hole material has high mechanical strength, the service life of the submersed nozzle can be prolonged greatly, and the continuous steel casting operation efficiency is increased; meanwhile, a tire cord steel billet is prevented from being broken easily in a wire drawing process of a produced tire cord steel billet, and the phenomena of impurity adhesion and blockage on the inner wall of the submersed nozzle can be prevented effectively.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesium-zirconium eutectic side hole material for a submerged nozzle. Background technique [0002] The submerged nozzle is installed between the tundish and the crystallizer to transport the molten steel from the tundish to the crystallizer, which protects the molten steel from secondary oxidation in continuous casting production, prevents nitrogen from dissolving or slag from mixing into molten steel, and prevents splashing. Stabilize the liquid flow field of the crystallizer, etc. During the pouring process, the submerged nozzle should not only bear the strong thermal shock at the initial stage of steel pouring, but also be eroded by molten steel and mold slag. Therefore, the submerged nozzle is required to have good thermal shock resistance, erosion resistance and slag erosion resistance. sex. [0003] The cord steel used to produce steel cords has very str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/043C04B41/81B22D41/54
CPCB22D41/54C04B35/043C04B41/009C04B41/45C04B41/81C04B2235/3244C04B2235/3418C04B2235/3821C04B2235/3826C04B2235/425C04B2235/428C04B2235/96
Inventor 张晗王次明郭钰龙刘丽车晓梅刘美荣鄢凤明刘靖轩王恒滕国强赵冉张盛徐业兴高梅
Owner 北京利尔高温材料股份有限公司
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