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Device and method for detecting liquidity of liquid casting powder

A detection device and detection method technology, applied to the configuration of indicating equipment/measuring equipment, manufacturing tools, casting equipment, etc., can solve the problems of long measurement cycle, insufficient rigor, no evaluation method for fluidity, etc., and achieve fast detection speed Effect

Active Publication Date: 2017-05-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) It is too arbitrary to use 1150°C as the evaluation standard for the quality of mold flux, and it is difficult to be suitable for all steel types;
[0006] 2) The definition standard of the onset of solidification temperature is not clearly defined, which makes the method not rigorous enough;
[0007] 3) This method focuses on the viscosity, and does not consider the interval between the initial solidification temperature and the complete solidification temperature;
[0008] 4) The measurement period is long, and the results are affected by human judgment
[0009] The fluidity of mold flux after melting reflects its ability to lubricate the slab in the continuous casting process, and is a very important performance design factor for the development of mold flux. However, there is no evaluation method for fluidity, and it is difficult to characterize it only by melting temperature and viscosity.

Method used

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  • Device and method for detecting liquidity of liquid casting powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Detection of an ultra-low carbon steel (liquidus temperature T ll =1532℃) with the fluidity of mold flux A. The length of the chute used is not less than 105cm, the inclination angle is 10°, the cross section of the chute is V-shaped, and the included angle of the V-shape is 90°;

[0054] The specific steps of the high temperature fluidity test are:

[0055] (1) Bake 150g of finished mold flux in a SiC wide-mouth container at a constant temperature of 700°C for 2 hours;

[0056] (2) Weigh 50g of the slag sample after complete burning, put it in a high-purity graphite crucible, and keep it in a high-temperature furnace at 1350°C for 15 minutes;

[0057] (3) Quickly take the graphite crucible out of the high-temperature furnace with tongs, and pour the molten slag onto the end of the launder with a plug at one time;

[0058] (4) The liquid slag flows down along the launder and gradually solidifies, and the measured length of the formed slag is 42cm.

[0059] The speci...

Embodiment 2

[0065] Detect a medium carbon steel (liquidus temperature T ll =1520℃) with the fluidity of mold flux B. The length of the chute used is not less than 105cm, the inclination angle is 10°, the cross section of the chute is V-shaped, and the included angle of the V-shape is 90°;

[0066] The specific steps of the high temperature fluidity test are:

[0067] (1) Bake 150g of finished mold flux in a SiC wide-mouth container at a constant temperature of 700°C for 2.5 hours;

[0068] (2) Weigh 50g of the slag sample after complete burning, put it in a high-purity graphite crucible, and keep it in a high-temperature furnace at 1350°C for 15 minutes;

[0069] (3) Quickly take the graphite crucible out of the high-temperature furnace with tongs, and pour the molten slag onto the end of the launder with a plug at one time;

[0070] (4) The liquid slag flows down along the launder and gradually solidifies, and the measured length of the formed slag is 84cm.

[0071] The specific step...

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Abstract

The invention relates to a continuous casting technology of a steel-making process, in particular to a device and a method for detecting liquidity of liquid casting powder. The method for detecting liquidity of the liquid casting powder comprises steps as follows: the casting powder after being molten at the required temperature is poured into a V-shaped chute with a certain inclined angle, the flow characteristic of the casting powder is evaluated on the basis of flow length of the liquid casting powder, and a high-temperature liquidity judgment method and a low-temperature liquidity judgment method are proposed; high-temperature liquidity is used for judging the flow-in condition of the liquid casting powder in the molten steel meniscus, and different kinds of casting powder have appropriate length ranges according to types of steel; low-temperature liquidity is used for judging the consumption condition of the liquid casting powder, and under the condition that the inclined angle of the chute is 10 degrees, measured temperature is lower than liquidus temperature of steel by 330 DEG C, and 10 cm is taken as basis for judging the low-temperature liquidity. The method for detecting liquidity of the liquid casting powder is used for simulating liquidity of the casting powder in gaps of a casting blank and a mold copper plate, and can rapidly predict conditions of lubrication and consumption of slag in a continuous casting process.

Description

technical field [0001] The invention relates to a steelmaking continuous casting technology, in particular to a liquid mold slag fluidity detection device and detection method. Background technique [0002] Continuous casting mold slag is a kind of auxiliary functional material for steelmaking covering the surface of molten steel in the mold of continuous casting machine in the steelmaking process. Various functions such as relative movement between slabs and control of heat transfer are the last process elements in the steelmaking process to control the surface quality of slabs. [0003] Usually, mold flux is made of CaO, SiO 2 Mainly binary system, with external CaF 2 、Na 2 O. Li 2 Flux such as O, and a small amount of Al 2 o 3 , MgO and other components and other unavoidable impurities (such as Fe 2 o 3 , MnO), is a mixed inorganic silicate material. Since the melting point of mold slag is 400-500°C lower than that of molten steel, a certain amount of carbonaceou...

Claims

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Application Information

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IPC IPC(8): B22D2/00B22D11/111
Inventor 张晨蔡得祥
Owner BAOSHAN IRON & STEEL CO LTD
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