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Slight center wave strip-shape control method of hot-rolled strip steel

A hot-rolled strip steel and control method technology, applied in the direction of contour control, etc., can solve problems such as residue, affecting hot-rolled production, rolling instability, etc., to improve the problem of strip shape scratches, and improve strip shape quality and thickness The effect of distribution flattening

Active Publication Date: 2015-04-15
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the shape defects of strip steel products affect the hot rolling production, which is likely to cause rolling instability, scrap steel, coil misalignment, etc., and on the other hand, affect the processing and use of downstream users
[0008] For thin and wide-sized products, since the double-sided waves are limited to a certain range on the side, when this micro-medium wave rolling method is adopted, the edge waves of the final product may not be well eliminated or the middle waves may remain, and even edge-center compounding may occur. Therefore, it is impossible to fundamentally improve the shape quality of the product

Method used

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  • Slight center wave strip-shape control method of hot-rolled strip steel
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  • Slight center wave strip-shape control method of hot-rolled strip steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] For a hot-rolled steel strip product with a specification of 2.3×1250mm, the target micro wave control amount is 0.6%. According to the method in this paper, when there is a certain deviation between the measured micro-medium wave value and the target value, the bending force adjustment of F2-F4 is used to control, so that the measured micro-medium wave reaches the target value. The related control parameter of bending force is α 2 =0.015,α 3 =0.041,α 4 =0.072. The control of the plate shape before and after the implementation of this method is shown in Table 1.

[0052] Table 1 The shape control situation under the old method and the new method

[0053] Test times

Embodiment 2

[0055] For a hot-rolled steel strip product, the specification is 3.0×1250mm, and the target micro wave control amount is 0.8%. According to the method in this paper, when there is a certain deviation between the measured micro-medium wave value and the target value, the bending force adjustment of F2-F4 is used to control, so that the measured micro-medium wave reaches the target value. The related control parameter of bending force is α 2 =0.017, α 3 =0.049,α 4 =0.087. The control of the plate shape before and after the implementation of this method is shown in Table 2.

[0056] Table 2 The shape control situation under the old method and the new method

[0057] Test times

Embodiment 3

[0059] For a hot-rolled strip product, the specification is 4.0×1460mm, and the target micro wave control amount is 1.1%. According to the method in this paper, when there is a certain deviation between the measured micro-medium wave value and the target value, the bending force adjustment of F2-F4 is used to control, so that the measured micro-medium wave reaches the target value. The related control parameter of bending force is α 2 =0.022,α 3 =0.050,α 4 =0.093. The control of the plate shape before and after the implementation of this method is shown in Table 3.

[0060] Table 3 The shape control situation under the old method and the new method

[0061] Test times

Number of rolls produced

Number of rolls with bad shape

defective rate

Before implementation

47

16

34.0%

after implementation

61

4

6.6%

[0062] The content to be protected by the present invention is as follows:

[0063] (1) The micro-medium...

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Abstract

The invention relates to a slight center wave strip-shape control method of hot-rolled strip steel. The method comprises the following steps: firstly, choosing a strip-shape feedback control frame; utilizing the adjusting manner of upstream frames, namely, adjusting the roll bending forces of the frames F2-F4 to realize the targeted slight center waves at a precision rolled outlet; secondly, controlling and adjusting the roll bending forces; detecting the flatness of the strip steel in real time by a strip-shape instrument and comparing it with a target value; if the deviation exists, adjusting the roll bending forces of the frames F2-F4. The slight center wave strip-shape control method of hot-rolled strip steel is applicable to overcoming strip-shape problems caused by the stages such as cooling and thermal treatment after hot rolling; the strip-shape quality of martensitic stainless steel strips is improved greatly and the scratching on the surface strip-shape in follow-up pickling and continuous annealing production is solved.

Description

technical field [0001] The invention relates to the field of hot-rolled steel strip production, in particular, the invention relates to a micro-wave shape control method for hot-rolled strip steel, which is suitable for shape quality control of hot-rolled strip steel products. Background technique [0002] Flatness is an important quality index of hot-rolled strip products. The poor shape of the strip is manifested externally as waves or buckling of the strip, and internally manifested as uneven distribution of internal residual stress, which is caused by uneven plastic deformation, phase transformation or temperature distribution along the width, length or thickness of the strip Wait. On the one hand, the shape defects of strip steel products affect the hot rolling production, which is easy to cause rolling instability, scrap steel, coil misalignment, etc., and on the other hand, affect the processing and use of downstream users. The shape of hot-rolled strip has always b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/28
CPCB21B37/28
Inventor 张国民焦四海杨宴宾
Owner BAOSHAN IRON & STEEL CO LTD
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