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A method of shape compensation rolling of hot-rolled strip steel

A technology of hot-rolled steel strip and hot-rolled strip, applied in the direction of contour control, etc., can solve problems such as double-sided waves or middle waves, achieve the effects of improving double-sided waves and middle waves defects, compensating for adverse effects, and improving the quality of plate shape

Active Publication Date: 2016-11-30
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to overcome the above problems, that is, in the production of hot-rolled strip steel, the problem of double-sided waves or middle waves of the strip caused by the cooling, coiling and heat treatment processes after rolling, the present invention aims to propose a rolling method through the implementation of flatness compensation. , that is, a hot-rolled strip shape compensation rolling method to improve the shape quality of the final strip product. A flatness compensation rolling method for hot-rolled strip steel is proposed to compensate for the adverse effects of the follow-up process on the strip shape, and to improve the defects of double-sided waves and middle waves of hot-rolled strip steel

Method used

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  • A method of shape compensation rolling of hot-rolled strip steel
  • A method of shape compensation rolling of hot-rolled strip steel
  • A method of shape compensation rolling of hot-rolled strip steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] For a hot-rolled strip product with double-sided waves, the measured amplitude and wavelength are calculated according to formula (1), as shown in Table 1:

[0047] Table 1 Amplitude, wavelength and warpage

[0048]

[0049] The value is a 1 =1.2, calculate the flatness compensation rolling control target of this product according to formula (2):

[0050] lambda c =1.2×1.25%=1.5%

[0051]The goal of online shape control is:

[0052] lambda aim =λ c =1.5%

[0053] This method is applied to the production control of hot rolling, and the old method and the new method are used for production respectively. Table 2 shows the shape of the hot-rolled rolling plate and the shape of the final product.

[0054] Table 2 Strip shape changes under the old method and the new method

[0055] serial number

Embodiment 2

[0057] For a hot-rolled strip product with double-sided waves, the measured wave amplitude and wavelength are calculated according to the above method. The warpage is 2.4%, the shape compensation rolling control target is 2.64%, and the online shape control target is 2.64%.

[0058] This method is applied to the production control of hot rolling, and the old method and the new method are used for production respectively. Table 3 shows the shape of the hot-rolled rolling plate and the shape of the final product.

[0059] Table 3 Strip shape changes under the old method and the new method

[0060]

Embodiment 3

[0062] For a hot-rolled strip product with mid-wave, the measured amplitude and wavelength are calculated according to the above method. The warpage is 1.2%, the shape compensation rolling control target is -2.16%, and the online shape control target is -2.16% .

[0063] This method is applied to the production control of hot rolling, and the old method and the new method are used for production respectively. Table 3 shows the shape of the hot-rolled rolling plate and the shape of the final product.

[0064] Table 4 Strip shape changes under the old method and the new method

[0065]

[0066] According to the present invention,

[0067] (1) This method improves the shape of the final strip product by implementing the shape compensation rolling method. The technical points include:

[0068] 1) Determination of the control target of flatness compensation rolling

[0069] In order to implement flatness compensation rolling, it is necessary to determine the flatness control ...

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Abstract

A hot-rolled strip shape compensation rolling method, that is, by implementing the shape compensation rolling method, comprises the following steps: determining the control target of the shape compensation rolling, that is, placing the strip steel with double-sided waves or middle waves On the platform, measure the wavelength and amplitude of the wave, regard the shortest vertical bar as a straight line, and the longest vertical bar as a sine wave, and use the warping waveform to represent the shape of the plate, which is the so-called warpage. When hot-rolled strip steel When the product presents a double-sided wave on both sides, the rolling plate shape needs to be compensated as a middle wave (middle wave defect); when the hot-rolled strip steel presents a middle wave (middle wave defect), the plate shape compensation amount during rolling is a double-sided wave value. According to the method of the present invention, according to the shape of the hot-rolled strip product, that is, the double-sided wave or the middle wave and its size, the adverse effects of the subsequent process on the shape of the plate can be compensated, and the defects of the hot-rolled strip double-sided wave and the middle wave can be improved.

Description

technical field [0001] The present invention relates to the field of hot-rolled steel strip production, in particular, the present invention relates to a hot-rolled strip shape compensation rolling method, the hot-rolled strip shape compensation rolling method is suitable for the shape quality of hot-rolled strip products control. Background technique [0002] Flatness (flatness) is an important quality index of hot-rolled strip products. [0003] The poor shape of the strip is externally manifested as waves or buckling of the strip, and the internal performance is uneven distribution of residual stress. The reason for the poor shape of the strip is the uneven plastic deformation, phase change or temperature distribution etc. 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. On the other hand, it also affects the processing and use of downstream user...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/28
Inventor 张国民焦四海陈龙夫
Owner BAOSHAN IRON & STEEL CO LTD