Coating material for preventing submersed nozzle from nodulation and preparation method thereof

A technology for nozzle nodule and coating material, which is used in manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of nodule blockage, easy baking and oxidation of immersed nozzles, etc., to reduce raw material costs and prevent oxidation. Good performance and stable properties

Active Publication Date: 2020-03-27
MAANSHAN IRON AND STEEL COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the submerged nozzle is easy to be baked and oxidized and nodules are blocked in the prior art, and provides a coating material for preventing submerged nozzle nodulation and its preparation method, which can not only prevent The immersion nozzle is baked and oxidized and the air enters the molten steel through the nozzle during use, and it can also prevent the immersion nozzle from being blocked by nodules

Method used

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  • Coating material for preventing submersed nozzle from nodulation and preparation method thereof
  • Coating material for preventing submersed nozzle from nodulation and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] A coating material for preventing nodulation of submerged nozzles in this embodiment, its raw materials include the following components by weight: mullite fine powder: 20, corundum fine powder: 15, Guangxi white mud: 4, activated alumina Micropowder: 7, Aluminum Dihydrogen Phosphate: 5, Flux: 8, Antioxidant: 2, Dispersant: 0.3. The coating material is mainly made of mullite fine powder, corundum fine powder, Guangxi white mud, quartz powder, activated alumina fine powder, etc., using aluminum dihydrogen phosphate as a binder, and adding flux, dispersant and anti- Oxidizing agent, the prepared coating has good adhesion and oxidation resistance. As the raw material part uses mullite fine powder, the properties of mullite are stable, and its melting point is 1850°C, which can not only reduce the raw material cost of the overall coating material, but also improve the thermal shock stability and high temperature performance of the submerged nozzle coating .

[0042] The f...

Embodiment 2

[0055] A coating material for preventing nodulation at the submerged nozzle of this embodiment is basically the same as that of Embodiment 1, the difference is: mullite fine powder 24, corundum fine powder 20, Guangxi white mud 8, active oxidation Aluminum fine powder 17, dihydrogen phosphate 7, waste glass powder 7.5, potassium feldspar 1.5, boron frit 1, aluminum powder 1, silicon powder 3, silicon carbide 6, carboxymethyl cellulose 2.

[0056] The preparation method of a coating for preventing nodules at the submerged nozzle of this embodiment is basically the same as that of Embodiment 1, except that in the mixing step: mullite fine powder, corundum fine powder, Guangxi White mud, activated alumina micropowder, flux, dispersant, and antioxidant are placed in water at a temperature of 70°C and mixed evenly, then aluminum dihydrogen phosphate is added, and then stirred for 5 minutes with a mixer. The slurry was obtained after ball milling for 3 h. The prepared coating is im...

Embodiment 3

[0060] A coating material for preventing nodules in the submerged nozzle of this embodiment is basically the same as that of Embodiment 1, the difference is: mullite fine powder 56, corundum fine powder 23, Guangxi white clay 8, active Alumina fine powder 18, aluminum dihydrogen phosphate 5, waste glass powder 6, potassium feldspar 2, boron frit 1, aluminum powder 0.5, silicon powder 1.5, silicon nitride fine powder 1.5, hydroxyethyl cellulose 1.

[0061] The preparation method of a coating for preventing nodules at the submerged nozzle of this embodiment is basically the same as that of Example 1, the difference being that in the mixing step: mullite fine powder, corundum fine powder, Guangxi White mud, activated alumina micropowder, fluxing agent, dispersant, and antioxidant are placed in water at a temperature of 60°C and mixed evenly, then aluminum dihydrogen phosphate is added, and then stirred with a mixer for 10 minutes, and the mixture is obtained after stirring evenly,...

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Abstract

The invention discloses a coating material for preventing a submersed nozzle from nodulation and a preparation method thereof, and belongs to the technical field of coating materials of submersed nozzles. The coating material comprises the following components in parts by weight: 20-56 parts of mullite fine powder, 15-23 parts of corundum fine powder, 4-8 parts of Guangxi white mud, 7-18 parts ofactivated aluminum oxide micro powder, 5-8 parts of aluminum dihydrogen phosphate, 8-12 parts of a fluxing agent, 2-11 parts of an antioxidant and 0.3-2.0 parts of a dispersing agent. The invention aims to solve the problems that in the prior art, a submersed nozzle is easy to bake and oxidize, and nodules are generated to block the submersed nozzle. According to the coating material for preventing the submersed nozzle from nodulation and the preparation method thereof, the purposes of preventing the submersed nozzle from being baked and oxidized and preventing air from entering molten steel through the nozzle in the using process can be achieved, and the submersed nozzle is prevented from blocking caused by nodulation.

Description

technical field [0001] The invention relates to the technical field of coating materials for submerged nozzles, in particular to a coating material for preventing nodules of submerged nozzles and a preparation method thereof. Background technique [0002] Currently, Al is commonly used in continuous casting 2 o 3 -C quality and Al 2 o 3 -ZrO 2 - C-quality submerged nozzles will directly oxidize with air during baking or use, resulting in loose structure and reduced strength of the product, affecting service life and causing great safety hazards. At the same time, when the molten steel passes through the inner wall of the nozzle, due to the decarburization of the inner wall surface, an uneven pore structure is formed, and the molten steel will produce local stagnation of the molten steel flow on the surface. When pouring aluminum-killed steel and other steel types, the molten steel will easily Oxidize elements such as Al to generate oxidation product Al 2 o 3 It is eas...

Claims

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Application Information

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IPC IPC(8): C04B41/88B22D41/54
CPCC04B41/88C04B41/5155B22D41/54C04B41/5096C04B41/5059C04B41/5092C04B41/5027C04B41/5031C04B41/5037C04B41/5022C04B41/4803C04B41/4539C04B41/4515C04B41/5066
Inventor 王洛刘自民饶磊汪雷王俊北樊明宇
Owner MAANSHAN IRON AND STEEL COMPANY
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