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On-line prognostication of thin strap continuous casting crackle and solidification organization, and control method thereof

A technology of solidification structure and control method, which is applied in the field of online prediction and control of thin strip continuous casting cracks and solidification structure, and can solve problems such as difficult hot processing, cracking, and cracks

Active Publication Date: 2009-07-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the coarser columnar crystals, they are more brittle and have the same orientation, which makes hot processing difficult
At the same time, impurities such as gas and inclusions are easy to concentrate on the contact surface of the columnar crystals grown from two adjacent mold walls, that is, the middle surface of the ingot, and cracks are easy to occur along these interfaces during the subsequent rolling process. , even ingots are prone to cracking along these interfaces when fast

Method used

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  • On-line prognostication of thin strap continuous casting crackle and solidification organization, and control method thereof
  • On-line prognostication of thin strap continuous casting crackle and solidification organization, and control method thereof
  • On-line prognostication of thin strap continuous casting crackle and solidification organization, and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] At the beginning of pouring, since the surface of the crystallization roller is in contact with the molten steel in the molten pool, the surface temperature will increase with time, and after a certain period of time, the surface temperature will reach a relatively stable state. When pouring stainless steel, the heat flux is modeled as

[0098] HF i =AT i +B

[0099] A=0.067, B=2

[0100] For stainless steel, when the detected surface temperature is greater than 180°C, the heat flux is greater than 14MW / m 2 , a crack alarm is issued.

[0101] Using the detected real-time surface temperature signal of the crystallization roller, the real-time ratio of equiaxed crystal regions can also be directly calculated according to the solidification structure model in the solidification structure module. The model for equiaxed domain proportions is:

[0102] ER i %=CT i +D

[0103] For stainless steel:

[0104] C=-0.277, D=120

[0105] When|ER i ,-ER i-1 |≤ε, the produ...

Embodiment 2

[0114] At the beginning of pouring, since the surface of the crystallization roller is in contact with the molten steel in the molten pool, the surface temperature will increase with time, and after a certain period of time, the surface temperature will reach a relatively stable state. When casting mild steel, the heat flux is modeled as

[0115] HF i =AT i +B

[0116] A=0.08; B=0

[0117] For low carbon steel, when the detected surface temperature is greater than 200°C, the heat flux is greater than 16MW / m 2 , a crack alarm is issued.

[0118] Using the detected real-time surface temperature signal of the crystallization roller, the real-time ratio of equiaxed crystal regions can also be directly calculated according to the solidification structure model in the solidification structure module. The model for equiaxed domain proportions is:

[0119] ER i %=CT i +D

[0120] For low carbon steel:

[0121] C=-0.3, D=80

[0122] When|ER i -ER i-1 |≤ε, the production pr...

Embodiment 3

[0129] At the beginning of pouring, since the surface of the crystallization roller is in contact with the molten steel in the molten pool, the surface temperature will increase with time, and after a certain period of time, the surface temperature will reach a relatively stable state. When casting high carbon steel, the heat flux is modeled as

[0130] HF i =AT i +B

[0131] A=0.05; B=3

[0132] For high carbon steel, when the detected surface temperature is greater than 160°C, the heat flux is greater than 11MW / m 2 , a crack alarm is issued.

[0133] Using the detected real-time surface temperature signal of the crystallization roller, the real-time ratio of equiaxed crystal regions can also be directly calculated according to the solidification structure model in the solidification structure module. The model for equiaxed domain proportions is:

[0134] ER i %=CT i +D

[0135] For high carbon steel take:

[0136] C=-0.58, D=123

[0137] When|ER i -ER i-1 |≤ε, t...

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Abstract

The invention discloses an online prediction and control method for thin strip continuous casting cracks and solidification structure. The present invention directly detects the surface temperature of the crystallization roller, transmits the detected real-time temperature signal to the heat flux density calculation module, and directly calculates the real-time heat flux density according to the heat flux density model; and inputs the calculated heat flux density to the crack judgment module , to judge whether cracks occur, and if cracks occur, an alarm signal is sent to realize online monitoring of the surface state of the crystallization roller. At the same time, the detected real-time temperature is transmitted to the equiaxed crystal calculation module, and the equiaxed crystal is calculated according to the equiaxed crystal calculation model; when the proportion of the equiaxed crystal region in the solidified structure is within the target range, that is: |ERi-ERi-1 |≤ε, then maintain the production process parameters unchanged; if the proportion of equiaxed grain area exceeds the allowable range, that is: |ERi-ERi-1|>ε, then it is necessary to adjust the production process parameters, namely, casting speed, thickness and liquid level Adjustment to achieve online control of the solidification structure of the cast strip.

Description

(1) Technical field [0001] The invention relates to thin strip continuous casting technology, in particular to an online prediction and control method for thin strip continuous casting cracks and solidification structures. (2) Background technology [0002] Reliable on-line monitoring and forecasting of continuous casting slab or casting strip quality, reducing casting slab defects, and satisfying service performance are extremely important for improving the quality of casting slab or casting strip. Whether it is conventional continuous casting or thin strip continuous casting, the solidification structure, shrinkage porosity, surface cracks and other defects in the continuous casting slab or strip, and even accidents such as steel breakouts are directly related to the copper plate of the water-cooled crystallizer or the water-cooled crystallization roller and the molten steel. related to heat transfer and cooling. The heat flux density can be used to represent the heat tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/16
Inventor 于艳方园叶长宏崔健
Owner BAOSHAN IRON & STEEL CO LTD