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A non-destructive method for characterizing the heat transfer performance of mold slag films

A technology of heat transfer performance and mold flux, which is applied in the field of continuous casting of iron and steel smelting, can solve the problems of longitudinal cracks on the surface of continuous casting slabs, affect the uniformity of heat transfer, and the initial slab shell is too thin, and achieve accurate temperature fluctuations and changes, The effect of accurate display and strong crystallization ability

Active Publication Date: 2020-07-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the slow heat transfer from the molten steel to the mold wall will affect the initial solidification of the molten steel, which will easily cause the initial slab shell to be too thin, and the continuous casting slab is prone to bulging defects and even serious accidents of steel leakage; the molten steel is horizontal to the mold wall Excessive heat transfer will affect the uniformity of heat transfer and cause longitudinal cracks on the surface of the continuous casting slab

Method used

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  • A non-destructive method for characterizing the heat transfer performance of mold slag films
  • A non-destructive method for characterizing the heat transfer performance of mold slag films
  • A non-destructive method for characterizing the heat transfer performance of mold slag films

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Embodiment 1

[0033] The experimental process of this example is to firstly mix the mold slag well, pre-melt it, and quench it with water to obtain a glass slag sample, then grind the glass slag sample into powder; then pick the powder slag onto the thermocouple platinum-rhodium wire, and then heat it at 15°C / The heating rate of s was increased to 1500°C to melt the mold slag, and the temperature was kept for 180s to eliminate air bubbles and uniform composition; then, the length of the liquid slag in the middle of the thermocouple at both ends was maintained at 15mm, and the cooling rate of the thermocouple at one end was reduced to 30°C / s. 800℃, and keep it warm for 300s to make the liquid slag solidify and crystallize under the high-low temperature gradient to form a mold slag film; A pulse temperature of 500°C is applied on the top, and the duration is 40s. The temperature control process is as attached figure 1 Shown; the thermocouple at the other end receives the heat transmitted thr...

Embodiment 2

[0035] Other conditions are the same as in Example 1, except that a pulse temperature of 550° C. is applied to the thermocouple at one end that does not cool down, and the duration is 50 s.

Embodiment 3

[0037] Other conditions are the same as in Example 1, except that a pulse temperature of 600° C. is applied to the thermocouple at one end that does not cool down, and the duration is 60 s.

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Abstract

The invention discloses a method for nondestructively representing heat transfer performance of a film of casting powder, and belongs to the technical field of ferrous metallurgy continuous casting. The film is formed under a certain temperature gradient mainly through a twin-wire thermocouple technology, and the process that a film is formed between molten steel and a crystallizer by casting powder in the actual continuous casting process is simulated; after the film is formed, the heat transfer performance of the film of the casting powder is represented by the method, and thus a technical path is provided for optimizing and designing casting powder with reasonable heat transfer performance. The method is used for measuring the heat transfer performance of the film structure of the casting powder in the actual continuous casting simulation process, and has great guidance significance for actual continuous casting production; the test process is simple and convenient, the test cost islow, sensitivity is high, and results are reliable.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and continuous casting, and relates to a method for simulating a mold slag film formed between molten steel and a crystallizer in a continuous casting process and non-destructively characterizing the heat transfer performance of the mold slag film. Background technique [0002] Continuous casting technology is one of the core technologies of modern steel industry. According to statistics, continuous casting production accounts for more than 90% of crude steel output. Continuous casting mold powder has important metallurgical functions such as heat insulation and heat preservation, absorption of non-metallic inclusions, lubrication of billet shell and control of heat transfer in the continuous casting process. Among them, the function of controlling heat transfer directly determines the surface quality of continuous casting slab. Studies have shown that the slow heat transfer from the molten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 王万林张磊黄道远周乐君翟冰钰朱晨阳
Owner CENT SOUTH UNIV