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A method for controlling surface pitting defects of short-process rolling medium-carbon low-alloy ultra-thin gauge strip steel

A control method and low-alloy technology, applied in the direction of rolling force/roll gap control, rolling mill control device, mass flow control device, etc., can solve problems such as difficult to control pitting defects

Active Publication Date: 2021-07-13
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for controlling pitting defects on the surface of medium-carbon and low-alloy ultra-thin strips in short-process rolling, so as to solve the problem of short-process rolling of medium-carbon and low-alloy extremely thin strips. The technical problem that steel pitting defects are difficult to control is to achieve the purpose of high-quality, low-cost and large-scale production of short-process rolling medium-carbon and low-alloy ultra-thin strip steel

Method used

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  • A method for controlling surface pitting defects of short-process rolling medium-carbon low-alloy ultra-thin gauge strip steel
  • A method for controlling surface pitting defects of short-process rolling medium-carbon low-alloy ultra-thin gauge strip steel
  • A method for controlling surface pitting defects of short-process rolling medium-carbon low-alloy ultra-thin gauge strip steel

Examples

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Effect test

Embodiment 1

[0046] A control method for pitting defects on the surface of medium-carbon and low-alloy ultra-thin strip steel in short-process rolling, using a CSP production line, including control of cooling water volume of work rolls in a rolling mill, rolling rhythm control, stand reduction rate control, and roll gap control. Lubrication control and speed-up rolling control, taking the production of Q235B with a thickness of 3.0mm as an example:

[0047] ①Work roll cooling water volume:

[0048]

[0049]

[0050] ②Rolling rhythm:

[0051] Finished product thickness / mm Rolling Rhythm(s) 3.0mm 140

[0052] ③Reduction rate of each frame:

[0053]

[0054] ④Roll Gap Lubrication:

[0055] frame F2 F3 F4 F5 F6 Roll Gap Lubricating Oil Volume (ml / min) 60 90 90 40 40

[0056]⑤Operation method of increasing speed rolling:

[0057]

[0058] Except for the above-mentioned five specific controls and / or steps, other operations are r...

Embodiment 2

[0061] A control method for pitting defects on the surface of medium-carbon and low-alloy ultra-thin strip steel in short-process rolling, using a CSP production line, including control of cooling water volume of work rolls in a rolling mill, rolling rhythm control, stand reduction rate control, and roll gap control. Lubrication control and speed-up rolling control, taking the production of Q235B with a thickness of 2.0mm as an example:

[0062] ①Work roll cooling water volume:

[0063]

[0064] ②Rolling rhythm:

[0065] Finished product thickness / mm Rolling Rhythm(s) 3.0mm 140

[0066] ③Reduction rate of each frame:

[0067]

[0068] ④Roll Gap Lubrication:

[0069] frame F2 F3 F4 F5 F6 Roll Gap Lubricating Oil Volume (ml / min) 70 95 95 50 50

[0070] ⑤Operation method of increasing speed rolling:

[0071]

[0072] Except for the above-mentioned five specific controls and / or steps, other operations are routine oper...

Embodiment 3

[0075] A control method for pitting defects on the surface of medium-carbon and low-alloy ultra-thin strip steel in short-process rolling, using a CSP production line, including control of cooling water volume of work rolls in a rolling mill, rolling rhythm control, stand reduction rate control, and roll gap control. Lubrication control and speed-up rolling control, taking the production of Q235B with a thickness of 1.5mm as an example:

[0076] ①Work roll cooling water volume:

[0077]

[0078] ②Rolling rhythm:

[0079] Finished product thickness / mm Rolling Rhythm(s) 3.0mm 140

[0080] ③Reduction rate of each frame:

[0081]

[0082] ④Roll Gap Lubrication:

[0083] frame F2 F3 F4 F5 F6 Roll Gap Lubricating Oil Volume (ml / min) 80 115 115 55 55

[0084] ⑤Operation method of increasing speed rolling:

[0085]

[0086] Except for the above-mentioned five specific controls and / or steps, other operations are routine op...

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Abstract

The invention discloses a method for controlling pitting defects on the surface of medium-carbon and low-alloy ultra-thin strip steel in short-process rolling, which includes the control of the cooling water volume of the work roll of the rolling mill, the control of rolling rhythm, the control of the reduction rate of the frame, and the lubrication of the roll gap Control and control of the commissioning mode of speed-up rolling. Compared with the prior art, the present invention solves the problem of pitting defects on the strip surface during short-flow medium-carbon low-alloy steel strip rolling, and realizes high quality and high stability of short-flow rolling medium-carbon low-alloy steel strip For the purpose of large-scale production, the method of the present invention does not need to transform equipment in the implementation process, and the existing equipment and control can be used; it is suitable for solving the problem of pitting defects on the surface of strip steel when all specifications of medium-carbon and low-alloy strip steel are rolled ; Simple, easy to operate, and strong practicability.

Description

technical field [0001] The invention relates to a method for controlling strip steel rolling, in particular to a method for controlling pitting defects on the surface of medium-carbon and low-alloy ultra-thin strip steel in short-process rolling, which is suitable for manufacturing strip steel products with a thickness of 1.2 to 4.0mm . Background technique [0002] The variety development of the CSP production line (thin slab continuous casting and rolling production line) is subject to the molten steel smelting and continuous casting process caused by the thinning of the slab, and due to its characteristics, it is more conducive to thin material production than conventional hot rolling, and at the same time Under the impetus of "cooling the tropics", the market potential of thin materials is huge. [0003] At present, when producing medium-carbon and low-alloy very thin strip steel, there is a problem that pitting defects are easily generated on the surface of the strip s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/40B21B3/02B21B37/00B21B37/58B21B45/02
CPCB21B1/40B21B3/02B21B37/00B21B37/58B21B45/0239B21B2037/002
Inventor 程曦王成郑海涛田军利高智
Owner 武汉钢铁有限公司