Launder for increasing flowing speed of molten steel by adding boron nitride

A technology of flow rate and boron nitride, which is applied in the field of metallurgy, can solve problems such as deterioration of alloy solidification structure and segregation, and achieve the effects of improving alloy purity, quality, and temperature reduction

Active Publication Date: 2020-12-01
沈阳金纳新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The excessively high pouring temperature mentioned above not only deteriorates the solidification structure and segregation of the alloy, but also inevitably increases oxygen, sulfur and inclusions due to the reaction between the high-temperature molten steel and the refractory material of the launder, which becomes a problem that is difficult to solve in the industry.

Method used

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  • Launder for increasing flowing speed of molten steel by adding boron nitride
  • Launder for increasing flowing speed of molten steel by adding boron nitride

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In the present embodiment, the launder preparation method of accelerating the flow rate of molten steel by adding boron nitride is as follows:

[0030] (1) 56.0% magnesium oxide, 34.5% aluminum oxide, and 9.0% boron nitride are uniformly mixed according to the following particle size weight percentages in a mixing tank.

[0031] In terms of weight percentage, the particle size distribution is: particle size<0.07mm accounts for 10%, 0.07mm≤particle size<1mm accounts for 15%, 1mm≤particle size<1.5mm accounts for 10%, 1.5mm≤particle size<2.5mm accounts for 10%, 2.5mm≤particle size<4mm accounted for 30%, 4mm≤particle size<7mm accounted for 20%, 7mm≤particle size<15mm accounted for 5%;

[0032] Among the above-mentioned refractory materials, the role of selecting specific proportions according to different particle sizes is to balance the strength, density, porosity, thermal expansion performance, and thermal shock resistance of the refractory moldings to ensure service life...

Embodiment 2

[0042] In the present embodiment, the launder preparation method of accelerating the flow rate of molten steel by adding boron nitride is as follows:

[0043] (1) 56.5% magnesium oxide, 33.5% aluminum oxide, and 9.4% boron nitride are uniformly mixed according to the following particle size weight percentages in a mixing tank.

[0044] In terms of weight percentage, the particle size distribution is: particle size<0.07mm accounts for 9%, 0.07mm≤particle size<1mm accounts for 16%, 1mm≤particle size<1.5mm accounts for 9%, 1.5mm≤particle size<2.5mm accounts for 11%, 2.5mm≤particle size<4mm accounted for 29%, 4mm≤particle size<7mm accounted for 21%, 7mm≤particle size<15mm accounted for 5%;

[0045] (2) Add 0.6% boric acid with particle size <0.07mm to the mixed launder refractory material, and mix evenly again.

[0046] (3) Pour the mixture obtained in step (2) into the launder mold, and tamp it into shape; pay attention to adding the mixture at a height of 10-15mm each time, and...

Embodiment 3

[0053] In the present embodiment, the launder preparation method of accelerating the flow rate of molten steel by adding boron nitride is as follows:

[0054] (1) 54.6% magnesium oxide, 35% aluminum oxide, and 10% boron nitride are uniformly mixed according to the following particle size weight percentages in a mixing tank.

[0055] In terms of weight percentage, the particle size distribution is: particle size<0.07mm accounts for 11%, 0.07mm≤particle size<1mm accounts for 14%, 1mm≤particle size<1.5mm accounts for 11%, 1.5mm≤particle size<2.5mm accounts for 9%, 2.5mm≤particle size<4mm accounted for 30%, 4mm≤particle size<7mm accounted for 19%, 7mm≤particle size<15mm accounted for 6%;

[0056] (2) Add 0.4% boric acid with particle size <0.07mm into the mixed launder refractory material, and mix evenly again.

[0057] (3) Pour the mixture obtained in step (2) into the launder mold, and tamp it into shape; pay attention to adding the mixture at a height of 10-15mm each time, and...

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to a launder for increasing the flowing speed of molten steel by adding boron nitride. The launder is prepared by mixing thefollowing materials in percentage by weight: 54.5 to 56.5% of magnesium oxide, 33 to 35% of aluminum oxide, 8 to 10% of boron nitride and 0.4 to 0.6% of boric acid. According to the invention, since the material of the launder is improved, frictional resistance between the launder material and the molten steel is reduced by improving the lubricating property between the launder material and the molten steel, so the initial pouring flow rate of the molten steel is improved, the production blockage accident of the molten steel in the long launder due to quick low-temperature drop of initial flowis avoided, the superheat degree, namely the pouring temperature of molten steel pouring is reduced to the maximum extent, and low and optimal pouring temperature control is achieved as much as possible; and therefore, the solidification crystallization structure of an alloy material is optimized, material performance is improved, high-temperature reaction pollution and cracking pollution of refractory materials are reduced, alloy purity is improved, and a solidification grain structure is optimized. As the frictional resistance of the molten steel and the launder is increased, the failure ofinitial pouring cutoff of the molten steel in production is avoided, and safe production is realized.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a launder for accelerating the flow velocity of molten steel by adding boron nitride. Background technique [0002] The solidification process of alloy metals will form a variety of microscopic metal structures according to different solidification process parameters (especially temperature), and different types of microstructures correspond to different alloy properties, so that alloy materials with different quality levels can be obtained. It is an ideal process route to optimize the alloy solidification structure and improve material properties by controlling the process parameters of the solidification process, especially the temperature parameters. [0003] Superalloys solidify through four levels of solidification process: macroscopic (cm-m) level, mesoscopic (mm-cm) level, microscopic (~μm) level and nanoscopic (~nm) level. The macroscopic solidification level from t...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/622C04B35/64B22D1/00
CPCC04B35/043C04B35/622C04B35/64B22D1/007C04B2235/3217C04B2235/386C04B2235/3409C04B2235/6562C04B2235/6567C04B2235/6565Y02P10/25
Inventor 李洪锡
Owner 沈阳金纳新材料股份有限公司
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