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A method for thermally adjusting width of continuous casting crystallizer

A continuous casting mold and thermal width adjustment technology, applied in the field of metallurgical continuous casting, can solve problems such as improper control of key parameters

Active Publication Date: 2019-03-22
CISDI ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method for thermal width adjustment of a continuous casting mold, which is used to solve the problem of improper control of key parameters during the thermal width adjustment of a continuous casting mold in the prior art. question

Method used

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  • A method for thermally adjusting width of continuous casting crystallizer
  • A method for thermally adjusting width of continuous casting crystallizer
  • A method for thermally adjusting width of continuous casting crystallizer

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Experimental program
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Effect test

Embodiment 1

[0078] According to the production process experience, the critical strain rate (When the temperature of medium carbon steel billet is 1350℃), the maximum air gap η max = 2mm, the minimum width of the slab 2W = 900mm, the effective height of the continuous casting mold L = 800mm. According to the previous formula, the setting values ​​of the model parameters can be obtained as shown in Table 1.

[0079] Table 1 Model parameter setting table

[0080]

Embodiment 2

[0082] Set the casting speed Uc=1200mm / min when adjusting the width, the effective height of the continuous casting mold L=800mm, and the process requirements: critical strain rate Maximum air gap η max = 2mm, the minimum width of the slab 2W = 900mm.

[0083] 1) Safe width adjustment area: the actual width adjustment horizontal acceleration is α=15mm / min 2 (less than the boundary condition α s =18mm / min 2 ), the angular velocity ω=0.0125rad / min, the air gap during the width adjustment process is η=1.67mm, the strain rate of the slab shell Then meet the maximum air gap limit condition (η≤η max ) and slab shell strength limit It can ensure that the narrow side of the continuous casting crystallizer is in close contact with the slab shell, fully and evenly cooled, prevents the narrow side from bulging, and at the same time ensures that the slab shell will not crack due to overpressure.

[0084]2) Unsafe width adjustment area: the actual width adjustment horizontal accel...

Embodiment 3

[0086] Assume that the casting speed Uc=1800mm / min when adjusting the width, the effective height of the continuous casting mold L=800mm, and the process requirements: critical strain rate Maximum air gap η max = 2mm, the minimum width of the slab 2W = 900mm.

[0087] 1) Safe width adjustment area: the actual width adjustment horizontal acceleration is α=32mm / min 2 (less than the boundary condition α s =36.45mm / min 2 ), then the angular velocity ω=0.018rad / min, the air gap during the width adjustment process is η=1·58mm, the strain rate of the slab shell Then meet the maximum air gap limit condition (η≤η max ) and the limit condition of slab shell strength It can ensure the close contact between the narrow side of the continuous casting crystallizer and the slab shell, fully and evenly cool down, prevent the narrow side from bulging, and at the same time ensure that the slab shell will not crack due to overpressure.

[0088] 2) Unsafe width adjustment area: the actual...

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Abstract

The invention provides a method for thermal width adjustment of a continuous casting crystallizer. The boundary condition for setting the horizontal acceleration of the thermal width adjustment of the continuous casting crystallizer is the minimum value limited by the maximum air gap and the strength of the billet shell. The invention can limit the maximum air gap between the narrow-side copper plate and the casting slab during the thermal width adjustment process of the continuous casting crystallizer, and ensure that the narrow-side copper plate and the casting slab are in full contact, so as to prevent the corners of the casting slab from cooling due to excessive thermal resistance of the air gap Insufficient, delayed solidification and thermal deformation stress concentration, resulting in defects such as cracks in the slab. At the same time, the strain of the slab shell is controlled to be less than the critical strain, so as to prevent the slab from collapsing and the concave-convex shape of the narrow side of the slab, which will cause the slab to be scrapped. Moreover, since the parameter setting of the width adjustment model is dynamically changed according to the change of the casting speed, the width adjustment can be completed within the full range of the drawing speed without additional increase or decrease of the drawing speed.

Description

technical field [0001] The invention relates to the field of metallurgical continuous casting, in particular to a method for thermally adjusting the width of a continuous casting crystallizer. Background technique [0002] The iron and steel metallurgy industry is one of the strategic industries of a country and is closely related to the national economy. As a key link in the iron and steel production process, continuous casting is the core link that deserves special attention in my country's steel production structure adjustment and technology upgrading strategy. In recent years, the continuous casting process has been developed to a very high technical level to expand the production range and improve product quality. Especially with the rise of the continuous casting and rolling process, the continuous casting machine must quickly match the production rhythm of hot rolling to provide billets that meet the specifications and sizes required by hot rolling. At the same time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/16
CPCB22D11/168
Inventor 何新军韩志伟彭晓华陈将
Owner CISDI ENG CO LTD
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