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Method for controlling surface pitting defect of medium-carbon low-alloy ultra-thin specification strip steel in short-process rolling

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 control of pitting defects, and achieve easy operation, strong practicability, and method easy-to-use effects

Active Publication Date: 2020-07-10
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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  • Method for controlling surface pitting defect of medium-carbon low-alloy ultra-thin specification strip steel in short-process rolling
  • Method for controlling surface pitting defect of medium-carbon low-alloy ultra-thin specification strip steel in short-process rolling
  • Method for controlling surface pitting defect of medium-carbon low-alloy ultra-thin specification strip steel in short-process rolling

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 the surface pitting defect of medium-carbon low-alloy ultra-thin strip steel in short-process rolling. The method comprises the following steps of controlling the cooling water amount of a working roll of a rolling mill, controlling the rolling rhythm, controlling the reduction rate of a rack, controlling roll gap lubrication and controlling the usemode of speed-up rolling. Compared with the prior art, the method has the advantages that the problem of surface pocking marks of the strip steel during rolling of the medium-carbon low-alloy strip steel in the short process is solved, the purpose of high-quality and high-stability large-scale production of the medium-carbon low-alloy strip steel during rolling in the short process is achieved, equipment does not need to be transformed in the implementation process, and existing equipment and control can be used; the method is suitable for solving the problem of surface pocking marks of stripsteel during rolling of medium-carbon low-alloy strip steel of all specifications; and the method is simple, easy to operate and high in 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 Applications(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
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