Method capable of controlling uniform crystal and eliminating needle crystal

A technology for controlling and protecting acicular crystallization, applied in the field of iron and steel smelting and continuous casting, can solve the problems of undisclosed acicular crystals, uncommon, large workload, etc., and achieves short experimental operation time, simple operation and small workload. Effect

Active Publication Date: 2020-03-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the current research is based on the second method. The reason is that the glass slag is obtained by rapid cooling after melting the mold slag, and then the temperature is raised. The experimental operation can be realized, but the workload is large in this process; phase is difficult, so studies using direct precipitation of homogeneous crystalline phases from liquid slag are not common
At the same time, after searching, it was found that the prior art did not disclose how to eliminate the reports of needle-like crystals that are easily produced during the crystallization process of mold flux

Method used

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  • Method capable of controlling uniform crystal and eliminating needle crystal
  • Method capable of controlling uniform crystal and eliminating needle crystal
  • Method capable of controlling uniform crystal and eliminating needle crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The experimental process of this example is to first mix the mold powder thoroughly and then grind it into powder; then pick the powder mold powder onto the thermocouple platinum rhodium wire, and then increase the temperature to 1773K at a heating rate of 15K / s to melt the mold powder, and keep it warm for 180s Eliminate air bubbles and uniform composition; then maintain the length of the liquid slag in the middle of the thermocouples at both ends at 2mm, and simultaneously lower the temperature of the thermocouples at both ends at a cooling rate of 30K / s to 1473K, and set the furnace temperature to 1473K while cooling , so that the furnace temperature and the temperature of the two thermocouples are the same, creating conditions for isothermal crystallization; after holding the temperature for 10 minutes to fully crystallize the liquid slag, turn off the temperature control system of the furnace and the two thermocouples at the same time, and remove the sample after coo...

Embodiment 2

[0053] The experimental process of this example is to first mix the mold powder thoroughly and then grind it into powder; then pick the powder mold powder onto the thermocouple platinum rhodium wire, and then increase the temperature to 1773K at a heating rate of 15K / s to melt the mold powder, and keep it warm for 180s Eliminate air bubbles and uniform composition; then maintain the length of the liquid slag in the middle of the thermocouples at both ends at 2mm, and simultaneously lower the temperature of the thermocouples at both ends at a cooling rate of 30K / s to 1273K, and set the furnace temperature to 1273K while cooling , so that the furnace temperature and the temperature of the two thermocouples are the same, creating conditions for isothermal crystallization; after holding the temperature for 10 minutes to fully crystallize the liquid slag, turn off the temperature control system of the furnace and the two thermocouples at the same time, and remove the sample after coo...

Embodiment 3

[0055] The experimental process of this example is to first mix the mold powder thoroughly and then grind it into powder; then pick the powder mold powder onto the thermocouple platinum rhodium wire, and then increase the temperature to 1773K at a heating rate of 15K / s to melt the mold powder, and keep it warm for 180s Eliminate air bubbles and uniform composition; then maintain the length of the liquid slag in the middle of the thermocouples at both ends at 2mm, and simultaneously lower the temperature of the thermocouples at both ends at a cooling rate of 30K / s to 1173K, and set the furnace temperature to 1173K while cooling , so that the furnace temperature and the temperature of the two thermocouples are the same, creating conditions for isothermal crystallization; after holding the temperature for 10 minutes to fully crystallize the liquid slag, turn off the temperature control system of the furnace and the two thermocouples at the same time, and remove the sample after coo...

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PUM

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Abstract

The invention belongs to the field of steel smelting continuous casting, and relates to an experimental method capable of controlling uniform crystal phase and eliminating needle crystal. According tothe experimental method, after protective slag is directly melted at the two ends of thermocouples by means of a thermocouple double-wire technology, a uniform and consistent environment of the crystallization temperature of the protective slag is created by controlling the same temperature of the thermocouples at the two ends and setting the same hearth temperature so that in the crystal solidification process of the liquid protective slag, the uniform crystal phase can be obtained and needle crystal can be eliminated. According to the experimental method, the process of crystallizing the protective slag from high temperature to low temperature in the continuous casting process in a factory is simulated, and is more like the actual production process, the obtained experimental data is more convincing, compared with the method for obtaining the crystal phase by re-rising the temperature of the glass slag obtained by quenching the molten protective slag, the experimental method has theadvantages that the experimental operation time is short, the steps are simple and convenient, the workload is smaller, and the obtained product has no needle crystal and the like.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and continuous casting, and relates to an experimental method capable of controlling the uniform crystal phase and eliminating needle crystals. Background technique [0002] There are two methods to obtain the crystalline phase of the mold flux. One is to directly melt the mold flux and heat it at a specified temperature to obtain the crystal phase; Keeping warm, the crystalline phase is precipitated from the glass phase. Most of the current research is based on the second method. The reason is that the glass slag is obtained by rapid cooling after melting the mold slag, and then the temperature is raised. The experimental operation can be realized, but the workload is large in this process; Phases are difficult, so studies using direct precipitation of homogeneous crystalline phases from liquid slag are not common. At the same time, it is found through retrieval that there is no report in...

Claims

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Application Information

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IPC IPC(8): B22D11/18
CPCB22D11/182
Inventor 王万林翟冰钰张磊黄道远张健康徐慧张华龙
Owner CENT SOUTH UNIV
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