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Method and device for controlling temperature drop in rough rolling process

A rough rolling and control unit technology, applied in the field of metallurgy, can solve problems such as affecting the surface quality of strip steel, affecting the yield of slabs, and unstable rolling process.

Active Publication Date: 2018-08-21
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the prior art, the embodiment of the present invention provides a method and device for controlling the temperature drop in the rough rolling process, which is used to solve the problem that the high temperature in the rough rolling process in the prior art will affect the yield of the slab and cause the rolling Unstable manufacturing process, which affects the technical problems of strip surface quality

Method used

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  • Method and device for controlling temperature drop in rough rolling process
  • Method and device for controlling temperature drop in rough rolling process
  • Method and device for controlling temperature drop in rough rolling process

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Embodiment 1

[0052] Corresponding to Embodiment 1, this embodiment also provides a device for controlling the temperature drop in the rough rolling process, such as Image 6 As shown, the device includes: a first control unit 51, a second control unit 52, a third control unit 53, and a fourth control unit 54; wherein,

[0053] Before rolling the slab, it is first necessary to descale the slab. In order to avoid heat conduction between the low-pressure water and the slab when the descaling and rolling is not in use (only the low-pressure water is turned on), the descaling nozzle is provided with a stop valve , the nozzle of the shut-off valve is closed. The first control unit 51 is used to control the flow rate of the descaling nozzle in the descaling area to be 98-105 L / min; preferably 100-102 L / min. Here, the nozzle striking force of the upper header is 0.78N / mm 2 , the impact force of the nozzle of the lower header is 0.84N / mm 2 .

[0054] Of course, not all descaling nozzles have sh...

Embodiment 3

[0065] In practical applications, when using the method provided in Embodiment 1 and the device provided in Embodiment 2 to perform rough rolling temperature drop on a certain type of slab, the specific implementation is as follows:

[0066] Before the slab is rolled, it is first necessary to descale the slab. In order to avoid the heat conduction between the low-pressure water and the slab when the descaling and rolling are not put into use (only the low-pressure water is turned on), the descaling nozzle is provided with a cut-off valve, the nozzle of the shut-off valve is closed.

[0067] During descaling and rolling, the flow rate of the descaling nozzle in the descaling area is controlled to 101.82L / min under the condition of ensuring the striking force. Here, the nozzle striking force of the upper header is 0.78N / mm 2 , the impact force of the nozzle of the lower header is 0.84N / mm 2 .

[0068] Of course, not all descaling nozzles have shut-off valves. There is a nozzl...

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Abstract

The invention provides a method and device for controlling temperature drop in the rough rolling process. The method comprises the steps that when a current slab is subjected to descaling, the flow ofa descaling nozzle in the descaling area is controlled to range from 98 L / min to 105 L / min, and the opening and closing state of a reverse water spraying nozzle in the rough rolling area and the opening and closing state of the descaling nozzle are controlled to be consistent; under the situation that the steel casting signal of a pinch roll at an outlet of a fixed-width unit area is collected, supply of cooling water of the pinch roller is controlled to be started; under the situation that it is collected that a next slab enters a fixed-width unit, supply of cooling water of the pinch rolleris controlled to be stopped; under the situation that the signal that the slab enters a vertical roller set at the first pass is collected, supply of cooling water of a vertical roller sliding rail is controlled to be in a stop state; under the situation that the tail-pass roughing mill steel casting signal is collected, supply of cooling water of the vertical roller sliding rail is controlled tobe in a start state, wherein a baffle is arranged on a fixed-width component of the fixed-width unit; a first water scraping plate is arranged on one side of a cooling water nozzle of the vertical roller sliding rail; and a blocking component is arranged on a dust restraining hole in a water tank in the rough milling area.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method and device for controlling the temperature drop in the rough rolling process. Background technique [0002] In the metallurgical industry, the process temperature drop is an important indicator in the rough rolling area, which is related to the processing cost, rolling stability and strip surface quality, and affects the comprehensive competitiveness of hot rolling. [0003] During the rough rolling process, the contact between the slab and the air, water, roller tables, and rolls will generate heat conduction, which will affect the temperature drop in the process. In order to ensure the final rolling hit rate, the temperature drop in the rough rolling process is too high, which will lead to a high temperature of the slab out of the furnace, which will increase the proportion of slab oxidation and burning in the heating furnace, affecting the yield and pro...

Claims

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Application Information

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IPC IPC(8): B21B37/74
Inventor 刘瑞光王建功王晓东高秀郁朱志鹏刘京涛胡亮韩乐
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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