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A kind of swing cooling method of hot rolled thick plate

A cooling method and cooler technology, which is applied in the cooling field of steel rolling production, can solve the problems of unable to cool the target temperature, affect the finishing rolling, straightening process and rolling rhythm, etc., to solve the problem of online cooling, wide application range, and huge promotion value effect

Active Publication Date: 2019-04-12
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method of oscillating cooling for hot-rolled thick plates, that is, a step-by-step oscillating cooling method. This method solves the problem that steel plates exceeding 50 mm thick cannot be cooled to the required target temperature by passing-through cooling, and solves the problem of passing-through cooling. Problems affecting the front and rear finish rolling, straightening process and rolling rhythm due to the swing cooling method

Method used

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  • A kind of swing cooling method of hot rolled thick plate
  • A kind of swing cooling method of hot rolled thick plate

Examples

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Embodiment 1

[0031] Example 1: Taking the production of 86mm thick Q235B steel plate as an example, the length is 8m, the exit of the finishing mill is 40m away from the accelerated cooling inlet, the accelerated cooling outlet is 38m away from the straightening machine inlet, and the roller table speed is 0.45m / s. Adopt attached Figure 1-2 The application technology of the stepwise swing cooling process is taken as an example to further describe the method. Attached figure 1 The temperature of the steel plate after the finishing rolling mill (1) is 989℃. figure 1 The 1# pyrometer (2) measures the temperature and the 1# steel plate detector (3) detects the incoming steel signal, and the steel plate is conveyed into the annex figure 1 Online accelerated cooling system (4), using attached figure 2 The upper cooler (12) and the lower cooler (13) perform cooling. Other related process parameters are set as follows: attached figure 2 The middle l cooler distance (9) is 1m, the L steel plate l...

Embodiment 2

[0032] Example 2: Taking the production of 62mm thick Q345B steel plate as an example, the length is 10m, the exit of the finishing mill is 40m from the entrance of accelerated cooling, the exit of accelerated cooling is 38m from the entrance of straightener, and the roller table speed is 0.50m / s. Adopt attached Figure 1-2 The application technology of the stepwise swing cooling process is taken as an example to further describe the method. Attached figure 1 The temperature of the steel plate after rolling in the finishing mill (1) is 912℃. figure 1 The 1# pyrometer (2) measures the temperature and the 1# steel plate detector (3) detects the incoming steel signal, and the steel plate is conveyed into the annex figure 1 Online accelerated cooling system (4), using attached figure 2 The upper cooler (12) and the lower cooler (13) perform cooling. Other related process parameters are set as follows: attached figure 2 The middle l cooler spacing (9) is 1m, the L steel plate leng...

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Abstract

The invention discloses a hot-rolled thick plate swing rolling method, and belongs to the technical field of rolled steel production cooling. According to the specific technology process, a steel plate with the thickness ranging from 50 mm to 200 mm after finish rolling is conveyed to an online acceleration cooling area through a transmission roller way, the thick steel plate at the temperature of 800 DEG C to 1000 DEG C is cooled to 250 DEG C to 750 DEG C in a swing cooling method, and after cooling, the steel plate is conveyed to a cooling bed through a straightening machine. The step-by-step swing cooling in the cooling area is adopted, through selecting of the proper swing section, the cooler opening amplitude, the forward and reverse direction swing distance, the step-by-step swing roller way speed and other process parameters are set, complete-length uniform cooling of the steel plate in the swing process is achieved, and the complete-length steel plate temperature difference is smaller than or equal to 8 DEG C. The problem that a passing type cooling manner is adopted in a thick steel plate with the thickness exceeding 50 mm, and cooling to the needed target temperature cannot be achieved is solved. The problem that the passing type swing cooling method is adopted, and front and back finishing, the straightening procedure and the rolling task are affected is solved; through the step-by-step swing cooling, the thick plate production rolling task is improved, and the production efficiency is improved by 24%.

Description

Technical field [0001] The invention belongs to the technical field of steel rolling production cooling and provides a swing cooling method for hot-rolled thick plates. Background technique [0002] The rolling line control cooling system controls the high-temperature austenite structure and phase transformation process of the steel by controlling the open cooling temperature, post-rolling cooling rate and final cooling temperature of the rolled piece, and finally controls the structure type, shape and distribution of the steel to achieve fine The purpose of improving the strength and toughness of the steel plate. The steel production line generally adopts the method of arranging a controlled cooling device after the finishing mill to develop and produce low-alloy steel, steel for construction machinery, steel for ship plates, and pipeline steel. In addition, for steel plates that do not need to control the phase transformation and organization process, controlled cooling is of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B45/02
CPCB21B45/0203
Inventor 刘涛余伟郭强李彦彬张勇军米振莉
Owner UNIV OF SCI & TECH BEIJING
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