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A method for improving the shape of cross-cut high-strength steel plates

A high-strength steel plate and shape technology, applied in the field of parameter control of high-strength steel plates, can solve problems such as large differences, inability to effectively eliminate the transverse arch of the steel plate, and difficulty in effectively straightening, so as to reduce the probability of warping objection, The effect of reducing the chance of operational failures and enhancing market competitiveness

Active Publication Date: 2015-10-28
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the cross-cutting and flattening production line of hot-rolled steel coils in China generally has the following two problems for the straightening of steel coils with yield strength ≥ 550MPa: 1) The manual measurement and observation of the steel plate shape during online production is good, but in the user When cutting and blanking, the steel plate is severely warped and deformed, which affects the normal use of the product, and it is more prominent for steel plates with a thickness ≥ 10mm; 2) It is difficult to straighten the steel plate in the transverse direction. If the setting of the straightening roll gap is too small, it will cause the steel plate to warp vertically. If the setting of the fine straightening roll gap is enlarged to ensure the vertical straightness of the steel plate, the transverse arch of the steel plate will not be effectively eliminated.
[0003] In view of the above two problems, through the analysis of the steel plate warping mechanism, it is found that the main reasons are as follows: 1) For the thicker high-strength steel plate, under the influence of the steel plate’s own weight, the residual stress inside the steel plate is not enough to cause the steel plate to warp. Warping deformation, when its own weight becomes smaller after being cut off, and the residual stress is greater than the stress generated by its own weight, the steel plate will warp; A set of straightening process parameters is adopted. In this way, for steel types with low strength, since this parameter fully meets the straightening requirements of each part of the entire steel coil, an ideal plate shape can be obtained. For high-strength steel plates, Since the original bending curvature of the strip is different, the original residual stress of the steel plate at the head and tail of the strip is also different, so the required straightening pressure is also different, and the difference is large. Among them, the adjustment is obtained according to the shape of the head Straightening parameters may not meet the straightening requirements of the belt tail, and it may not be manifested in the production process, resulting in hidden shape defects of the steel plate; 3) The transverse bow unevenness of the steel plate must be passed through the rough leveler The large reduction straightening can be improved

Method used

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  • A method for improving the shape of cross-cut high-strength steel plates
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  • A method for improving the shape of cross-cut high-strength steel plates

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Embodiment 1

[0031] The method of the present invention is mainly applied to steel types such as T700 / TQ600MAC / TH800 / TS700MC / S700MC / TQ960C, and ensures that the transverse unevenness of the steel plate is not greater than 5mm / m, and the longitudinal unevenness is not greater than 8mm / m.

[0032] Take the production of the following types of steel plates as an example: Type: Steel: TQ600MCD Specification: 12*1800mm;

[0033] In order to prevent the warping defects of the finished steel plate, the stage-by-stage control values ​​of the fine-roll gap and the rough-roll gap are as follows:

[0034]

[0035] That is: in the rough straightening process, the entrance roll gap before threading is -30mm, and the exit roll gap is -15mm; The height is 5mm. When the uncoiler is ready to throw steel, the entrance roll gap is raised by 25mm to ensure that the tail of the strip is straight and not upturned. In the fine straightening process, the entrance roll gap is 0.5-2.8mm before the strip is thre...

Embodiment 2

[0038] Take the production of the following types of steel plates as an example: Type: Steel: TQ700MCD Specification: 10*1500mm;

[0039] In order to prevent the warping defects of the finished steel plate, the stage-by-stage control values ​​of the fine-roll gap and the rough-roll gap are as follows:

[0040]

[0041] That is: in the rough straightening process, the entrance roll gap before threading is -40mm, and the exit roll gap is -10mm; The height is 5mm. When the uncoiler is ready to throw steel, the entrance roll gap is raised by 30mm to ensure that the tail of the strip is straight and not upturned. In the fine straightening process, before the strip is threaded, the entrance roll gap is 0.2-2.2mm, and the exit roll gap is 6.3mm; when the strip head passes through the fine straightening exit, adjust the exit roll gap so that the strip head is in a slightly warped state, and the warped height is + 2~+15mm (it is absolutely forbidden to buckle with the head down), w...

Embodiment 3

[0044] Take the production of the following types of steel plates as an example: Type: Steel: T700 Specification: 6*1800mm;

[0045] In order to prevent the warping defects of the finished steel plate, the stage-by-stage control values ​​of the fine-roll gap and the rough-roll gap are as follows:

[0046]

[0047]That is: in the rough straightening process, the entrance roll gap before threading is -50mm, and the exit roll gap is -20mm; The height is 10mm. When the uncoiler is ready to throw steel, the entrance roll gap is raised by 25mm to ensure that the tail of the strip is straight and not upturned. In the process of fine straightening, the entrance roll gap is -1.5-1.2mm before the strip is threaded, and the exit roll gap is 2.6mm; +2~+15mm (it is absolutely forbidden to buckle with the head down), when the diameter of the steel coil on the uncoiler is 1 / 2 of the diameter of the original steel coil, press down the roll gap of the fine straightening exit by 1.3mm to en...

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Abstract

The invention discloses a method for improving the shape of a transversely-cut high-strength steel plate, and belongs to the technical field of control over parameters of high-strength steel plates. The method includes the steps of controlling the final transverse unevenness of the steel plate by adjusting rough straightening parameters in a segmented mode, and controlling the final longitudinal unevenness of the steel plate by adjusting the refined straightening parameters in a segmented mode. By analyzing reasons and mechanisms for production of transverse unevenness and longitudinal unevenness of the high-strength steel plate, through combination with the basic principle of the steel plate straightening technology and the inherent characteristics of hot rolled coils, the method for adjusting and controlling the clearance between rollers of a rough straightening machine and a refined straightening machine of a transverse cutting unit is specifically improved, and therefore a good straightening effect of the steel plate is effectively ensured at different stages, and the unevenness index of the steel plate meets the technical standard requirement.

Description

technical field [0001] The invention relates to a method for improving the shape of a cross-cut high-strength steel plate, which belongs to the technical field of parameter control of high-strength steel plates. Background technique [0002] At present, the cross-cutting and flattening production line of hot-rolled steel coils in China generally has the following two problems for the straightening of steel coils with yield strength ≥ 550MPa: 1) The manual measurement and observation of the steel plate shape during online production is good, but in the user When cutting and blanking, the steel plate is severely warped and deformed, which affects the normal use of the product, and it is more prominent for steel plates with a thickness ≥ 10mm; 2) It is difficult to straighten the steel plate in the transverse direction. If the setting of the straightening roll gap is too small, it will cause the steel plate to warp vertically. If the setting of the fine straightening roll gap i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D1/02
Inventor 赵胜林解颜
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD