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Method for controlling thickness stability of cast strip in twin-roll thin-strip continuous casting

A twin-roll thin strip continuous casting and stability technology, which is applied in the field of controlling the thickness stability of the cast strip in twin-roll thin strip continuous casting, can solve problems such as difficulty in casting strip thickness and difficult control of cast strip thickness stability, and achieve stable Control the thickness of the cast strip, improve the surface quality and the stability of hot rolling, and improve the effect of the surface quality

Pending Publication Date: 2022-05-31
SHAGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the twin-roll thin strip continuous casting process, since the cast strip is directly solidified from molten steel into a solid slab shell, it is difficult to control the thickness of the cast strip through the roll gap of the casting rolls, and it is even more difficult to control the stability of the cast strip thickness

Method used

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  • Method for controlling thickness stability of cast strip in twin-roll thin-strip continuous casting
  • Method for controlling thickness stability of cast strip in twin-roll thin-strip continuous casting
  • Method for controlling thickness stability of cast strip in twin-roll thin-strip continuous casting

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The thickness H of the twin-roll thin strip continuous casting is set to 2.0mm, the height of the molten pool h is 230mm, the radius R of the casting rolls is 545mm, and the temperature of the molten steel in the molten pool is T L is 1690°C, the solidus temperature T of the molten steel being cast B is 1535°C, and the empirical parameter α related to the heat transfer of casting rolls is 1.6*10 -4 , and the empirical parameter β related to molten steel composition is 0.13, through the formula The calculated real-time casting speed v is 2.46m / s, and the casting-rolling force CF is 4kN.

[0037] In this embodiment 1, through the real-time control of the casting speed and the control of the casting and rolling force, the thickness fluctuation of the cast strip during the continuous casting process is small, and the stability of the obtained cast strip is improved.

Embodiment 2

[0039] The thickness H of the twin-roll thin strip continuous casting is set to 1.5mm, the height h of the molten pool is 195mm, the radius R of the casting roll is 463mm, and the temperature of the molten steel in the molten pool is T L is 1640°C, the solidus temperature T of the molten steel being cast B is 1448°C, and the empirical parameter α related to the heat transfer of casting rolls is 1.1*10 -4 , and the empirical parameter β related to molten steel composition is 0.08, through the formula The calculated real-time casting speed v is 1.02m / s, and the casting-rolling force CF is 10kN.

[0040] In Example 2, through the real-time control of the casting speed and the control of the casting and rolling force, the thickness fluctuation of the cast strip during the continuous casting process is small, and the stability of the obtained cast strip is improved.

Embodiment 3

[0042] The thickness H of the twin-roll thin strip continuous casting is set to 2.5mm, the height h of the molten pool is 158mm, the radius R of the casting rolls is 498mm, and the temperature of the molten steel in the molten pool is T L is 1615°C, the solidus temperature T of the molten steel being cast B is 1489°C, and the empirical parameter α related to the heat transfer of casting rolls is 1.5*10 -4 , and the empirical parameter β related to molten steel composition is 0.3, through the formula The calculated real-time casting speed v is 3.31m / s, and the casting-rolling force CF is 16kN.

[0043]In Example 3, through the real-time control of the casting speed and the control of the casting and rolling force, the fluctuation of the thickness of the cast strip during the continuous casting process is small, and the stability of the obtained cast strip is improved.

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Abstract

The invention relates to casting process control of double-roller thin-strip continuous casting, in particular to a stability control method for the thickness of a cast strip of the double-roller thin-strip continuous casting. According to the method for controlling the thickness stability of the cast strip in double-roller thin-strip continuous casting, a control model is established by setting the thickness of the cast strip, the casting speed, the molten steel temperature of a molten pool, the solidus temperature and the radius parameters of the casting rollers, and meanwhile, the stability control of the thickness of the cast strip can be better realized by combining and controlling the casting and rolling force of the crystallization rollers. The model is applied to casting process control of double-roller thin-strip continuous casting, and can be specifically used for parameter setting in the initial casting stage and the casting process. And on the other hand, the model improves the stability of the thickness of the cast strip, the surface quality of the cast strip and the stability of subsequent hot rolling through quick response of the casting speed.

Description

technical field [0001] The invention relates to the casting process control of twin-roll thin strip continuous casting, in particular to a method for controlling the thickness stability of cast strip in twin-roll thin strip continuous casting. Background technique [0002] The twin-roll thin-strip casting process is to enter the molten steel into the molten pool formed by a pair of oppositely rotating casting rolls through the distribution nozzle. Lead out of the casting roll surface to form a continuous casting belt. [0003] The thickness stability of the cast strip is crucial for the production stability of a thin strip casting line. Specifically, the stability of the cast strip is directly related to the surface quality of the cast strip. The thickness of the cast strip fluctuates, which tends to form irregular pits on the surface of the cast strip. The thickness instability of the cast strip directly affects the subsequent hot rolling. The fluctuation of cast strip ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18
CPCB22D11/18
Inventor 施一新陈爱华李化龙刘玉君翟义庆李晓佳
Owner SHAGANG GROUP
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