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Control Method of Ultra-rapid Cooling in Hot Continuous Rolling Line

A technology of ultra-fast cooling and control method, applied in the direction of temperature control, etc., can solve the problems such as the cooling temperature cannot be accurately controlled, the cooling speed is uneven in the thickness direction of the strip, and can reduce the temperature difference between the steel core and the surface, accurately set, guarantee The effect of uniformity

Active Publication Date: 2019-04-23
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application provides a control method for ultra-rapid cooling of a hot continuous rolling line, which solves the technical problems in the prior art that the cooling rate in the thickness direction of the strip is not uniform in the cooling process after rolling, and the cooling temperature cannot be accurately controlled, and realizes The post-rolling water cooling process with uniform cooling rate in the thickness direction of hot-rolled strip and high-precision temperature control

Method used

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  • Control Method of Ultra-rapid Cooling in Hot Continuous Rolling Line
  • Control Method of Ultra-rapid Cooling in Hot Continuous Rolling Line
  • Control Method of Ultra-rapid Cooling in Hot Continuous Rolling Line

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Embodiment 1

[0048] Such as figure 1 As shown, the embodiment of the present invention provides a control method for ultra-rapid cooling of hot continuous rolling line, adopting such as figure 2 In the way shown, the ultra-fast cooling equipment is arranged between the finishing rolling and the laminar cooling system, and the method is as follows: image 3 In the cooling process path shown, the ultra-fast cooling equipment is used alone to realize the water cooling process of hot-rolled strip steel after rolling, and the temperature distribution in the thickness direction of the cooling process is shown in Figure 4 As shown, the specific steps are as follows:

[0049] Step S1: setting the ultra-fast cooling system on the rear side of the finishing rolling system;

[0050] Step S2: after the strip passes through finish rolling, define the opening sequence of the ultra-fast cooling header of the ultra-rapid cooling system;

[0051] Step S3: Calculate the temperature drop that can be gen...

Embodiment 2

[0083] A control method for ultra-rapid cooling of a hot continuous rolling line provided in this embodiment, the specific steps are as follows:

[0084] Step A1: setting the ultra-fast cooling system on the rear side of the finishing rolling system;

[0085] Step A2: After the strip passes the finish rolling, define the opening sequence of the ultra-fast cooling headers, divide the ultra-fast cooling headers into 4 groups, each group consists of 10 ultra-fast cooling headers, and the ultra-fast cooling headers are divided into 4 groups. The pre-defined opening sequence of the header is: 40,39,38,1,11,21,31,10,20,30,5,15,25,35,2,12,22,32,8,18,28 ,3,13,23,33,7,17,27,37,6,16,26,36,9,19,29,4,14,24,34;

[0086] Step A3: The numbers of the ultra-fast cooling headers to be opened are: 1, 2, 5, 8, 10, 11, 12, 15, 18, 20, 21, 22, 25, 28, 30, 31, 32, 35 ,38,39,40, the corresponding cooling efficiency superposition coefficients are: 0.9,0.9,1.0,1.0,0.85,0.85,0.85,1.0,1.0,0.85,0.85,0.8...

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Abstract

The invention discloses a super-fast cooling control method for a hot continuous rolling line. The super-fast cooling control method comprises the steps that after finish rolling is conducted on stripsteel, the opening sequence of super-fast cold collection pipes of a super-fast cooling system is defined; the temperature drop values generated by the super-fast cold collection pipes required to beopened are calculated; the temperature drop sum generated by the super-fast cold collection pipes required to be opened is calculated; the difference value of the temperature drop sum and the final rolling temperature target value is compared with a process target value, and when the difference value of the temperature drop sum and the final rolling temperature target value deviates from the target value, the opening sequence of the super-fast cold collection pipes of the super-fast cooling system is redefined; and when the temperature drop sum conforms to the target value, the super-fast cooling system is started to cool the strip steel. By the adoption of the super-fast cooling control method for the hot continuous rolling line, cold-speed uniformization of the thickness direction of the hot-rolled strip steel and the temperature-high-precision-controlled post-rolling water cooling process are achieved.

Description

technical field [0001] The invention relates to the technical field of hot continuous rolling, in particular to a method for controlling ultra-rapid cooling of a hot continuous rolling line. Background technique [0002] In the production process of domestic conventional hot rolling line products, the post-rolling cooling of strip steel is mainly realized by laminar flow cooling to realize the water cooling process of strip steel after rolling. Due to the low cooling efficiency of the laminar cooling system, it is not enough to meet the production needs of some thick specifications, low cost and high quality products. As the society's demand for high-quality hot-rolled strip steel increases year by year, the application of ultra-rapid cooling technology has attracted much attention in the production process of hot-rolled strip steel. The ultra-fast cooling system uses high-pressure, large-flow cooling water to cool the strip, thereby realizing the ultra-rapid cooling proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/76
Inventor 李旭东徐芳刘子英龚波张长利王凤琴艾矫健
Owner SHOUGANG CORPORATION
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