Method for promoting uniformity of cooling-control temperature of hot-rolled steel sheet
A technology for controlling cooling and hot-rolling steel plates, applied in the direction of temperature control, etc., can solve the problems of difficult uniform temperature field, reduce the temperature drop at the head and tail of the steel plate, unqualified plate shape, etc., and achieve the effect of uniform temperature field
Active Publication Date: 2012-03-21
SHOUGANG CORPORATION
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Problems solved by technology
In addition, the shape of the steel plate is closely related to the temperature, and the uneven temperature will lead to uneven deformation of the steel plate, causing the problem of unqualified plate shape
The traditional solution to solve the overcooling of the head and tail of the steel plate in the process of controlled cooling is the head and tail shielding, that is, when the head and tail of the steel plate enter the water, the water volume of the cooling water spray device is reduced, thereby reducing the temperature drop at the head and tail of the steel plate , the disadvantages of this method are: the response time of the water supply valve is very high, and it is not suitable for control; in the case of a short cooling area, it is very difficult to control the switching water; in addition, the head and tail of the steel plate is a gradual temperature field. , the change of cooling water volume is a sudden change process, and it is not easy to obtain a uniform temperature field
Method used
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Embodiment 1
[0024] Taking a medium and heavy plate production line as an example, the specific implementation of the present invention will be described.
[0025] The cooling area of the production line is 9m long, and the "temperature drop-cooling time" curve of the cooling equipment during production is calculated as follows: figure 1 Shown, including typical specifications such as thickness 15mm, 20mm, 30mm and 40mm.
[0026] The cooling intensity of the cooling device is controlled to remain unchanged, and the steel plate is divided into three areas: the head low temperature area, the uniform temperature area, and the tail low temperature area, and the residence time of the three areas of the steel plate in the cooling device is controlled by changing the speed of the roller table.
[0027] Taking a 20mm thick × 30m long steel plate as an example, the process requires that the uniform temperature area of the steel plate be reduced from the initial temperature of 800°C to 500°C, an...
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The invention relates to a method for promoting uniformity of a cooling-control temperature of a hot-rolled steel sheet and belongs to the technical field of a rolling-control and cooling-control process of a medium plate. After the hot-rolled steel sheet passes through a cooling-control device, cooling intensity of the cooling-control device is kept unchanged, the hot-rolled steel sheet is divided into three areas, namely, a head low-temperature area, a uniform temperature area and a tail low-temperature area, and retention time of the three areas in the cooling-control device is controlled by changing the speed of a roller, so that a uniform final-cooling temperature can be obtained. The method has the advantages that the demand on response time of a water supply valve is low, the process is easily controlled, the shielding for the head and tail of the steel sheet is realized under a condition of a shorter cooling area, the shielding of the steel sheet is smoothly transited and a more uniform temperature field is acquired.
Description
technical field [0001] The invention belongs to the technical field of controlled rolling and controlled cooling of medium and heavy plates, and in particular relates to a method for improving the uniformity of controlled cooling temperature of hot-rolled steel plates. Background technique [0002] Controlled cooling is an important technology for producing low-cost high-grade steel plates. Due to the rapid heat dissipation at the edge of the steel billet, the temperature at the head and tail is relatively low. After the process, the supercooled areas may show unacceptable properties and need to be cut, thereby reducing the yield of the plate. In addition, the amount of cutting head and tail of the steel plate in production is fixed. If the supercooled area is too large, it may not be cut cleanly, causing the performance of the steel plate to be unqualified. Therefore, improving the temperature uniformity of controlled rolling and controlled cooling steel plate is of great ...
Claims
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IPC IPC(8): B21B37/76
Inventor 马长文李家鼎田士平董占斌田鹏姜中行丁文华朱振华吕延春
Owner SHOUGANG CORPORATION