Cooling method for improving water outlet uniformity of thick plate

Abstract

The invention discloses a cooling method for improving water outlet uniformity of a thick plate, which relates to the technical field of metallurgy and comprises the following steps: setting heating parameters of a plate blank, and rolling the plate blank after heating and discharging; cooling parameters of the plate blank are set, the steel plate is controlled to enter a cooling area to be cooled, and cooling is completed after the preset self-tempering temperature is reached; wherein the cooling parameters comprise the flow of the cooling headers, the multiple sets of cooling headers in the cooling area are sequentially arranged in the moving direction of the steel plate, and the flow of the cooling headers located on the front half portion in the cooling area is larger than that of the cooling headers located on the rear half portion in the cooling area. The mode of increasing the flow of the collecting pipe and increasing the roller speed is adopted, the problem that the temperature in the thick plate is too high is effectively solved, and the uniformity of the performance of the steel plate is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a cooling method for improving water discharge uniformity of thick plates. Background Art

[0002] TMCP thick plates above 50mm often require strong cooling to ensure the mechanical properties of the steel plates. The cooling equipment often needs to open more cooling headers. The steel plates generally appear like pot bottoms during the cooling process, and the steel plates return to flatness after the subsequent cooling is completed. Since the thick plates appear like pot bottoms during the cooling process, water accumulates in the middle of the steel plates, and the water film is thick. Conventional cooling cannot penetrate the water film, resulting in high temperatures in the steel plates, and the strength of the high temperature parts is lower than the normal parts. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art and provide a cooling method for improving the uniformity of water discharge from thick plates.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows: A cooling method for improving the uniformity of water discharge from a thick plate, comprising: Set the heating parameters of the slab and roll the slab after it is heated out of the furnace; Set the cooling parameters of the slab, control the steel plate to enter the cooling zone for cooling, and complete the cooling after reaching the preset red-hot temperature; Among them, the cooling parameters include cooling manifold flow rate, and several groups of cooling manifolds in the cooling zone are arranged in sequence along the moving direction of the steel plate, and the flow rate of the cooling manifold located in the front half of the cooling zone is greater than the flow rate of the cooling manifold located in the rear half of the cooling zone.

[0005] As a preferred solution of the cooling method for improving the uniformity of water discharge of thick plates according to the present invention, the flow rate of the cooling header located in the front half of the cooling zone is set to 200m 3 / h, the flow rate of the cooling header located in the second half of the cooling zone is set to 120m 3 / h.

[0006] As a preferred solution of the cooling method for improving the uniformity of water discharge of thick plates described in the present invention, the cooling parameters also include a cooling roller speed, and the cooling roller speed is set to 1 m / s.

[0007] As a preferred solution of the cooling method for improving the uniformity of water discharge from thick plates described in the present invention, the cooling parameters also include a cooling water ratio, and the cooling water ratio is set to 1.5.

[0008] As a preferred solution of the cooling method for improving the uniformity of water discharge from thick plates described in the present invention, the cooling parameters also include a red-return temperature, and the red-return temperature is set to 620±20°C.

[0009] As a preferred solution of the cooling method for improving the uniformity of water discharge of thick plates according to the present invention, the step of setting the heating parameters of the slab and rolling the slab after heating out of the furnace comprises: Load the slab into the heating furnace and heat it to 1133°C; After heating out of the furnace, the slab is rolled, and the rolling is completed when the steel plate thickness reaches 50 mm and the final rolling temperature reaches 820°C.

[0010] The beneficial effects of the present invention are: The present invention adopts the method of increasing the flow rate of the header and improving the roller speed, which effectively solves the problem of high temperature in the thick plate and improves the uniformity of the performance of the steel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0012] Figure 1 This is a schematic diagram of the overall temperature uniformity of the steel plate obtained by the original cooling process; Figure 2 A schematic diagram of the overall temperature uniformity of a steel plate obtained by using the cooling method provided by the invention to improve the uniformity of water discharge from a thick plate. DETAILED DESCRIPTION

[0013] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific implementation modes and in combination with the accompanying drawings.

[0014] The present application provides a cooling method for improving the uniformity of water discharge from a thick plate, the method specifically comprising the following steps: Step S101: setting heating parameters of the slab, and rolling the slab after heating out of the furnace.

[0015] Specifically, after the slab is loaded into the furnace, it is heated to 1133° C. according to the preset heating process. After the slab is taken out of the furnace, it is rolled according to the preset rolling process, and the rolling is completed when the thickness of the steel plate reaches 50 mm and the final rolling temperature reaches 820° C.

[0016] It should be noted that, in this embodiment, the slab steel grade is A40-T, the slab specifications are 260*2770*3791mm, and the rolled steel grade is EH36.

[0017] Step S102: setting cooling parameters of the slab, controlling the steel plate to enter the cooling zone for cooling, and completing cooling after reaching a preset red-return temperature; Among them, the cooling parameters include cooling manifold flow rate, and several groups of cooling manifolds in the cooling zone are arranged in sequence along the moving direction of the steel plate, and the flow rate of the cooling manifold located in the front half of the cooling zone is greater than the flow rate of the cooling manifold located in the rear half of the cooling zone.

[0018] Specifically, in this embodiment, thirteen groups of cooling headers are provided in the cooling zone, numbered 1 to 13. Along the moving direction of the slab, groups 1 to 7 of cooling headers are located in the front half of the cooling zone, and groups 8 to 13 of cooling headers are located in the back half of the cooling zone. The cooling parameters are set as follows: the flow rate of groups 1 to 7 of cooling headers is 200m 3 / h, the flow rate of 8~13 cooling headers is set to 120m 3 / h.

[0019] It should be noted that the cooling parameters also include the cooling roller speed, the cooling water ratio and the red-returning temperature. In this embodiment, the cooling roller speed is set to 1 m / s, the cooling water ratio is set to 1.5, and the red-returning temperature is set to 620±20°C.

[0020] Compared with the original cooling process, the flow rate in the front half of the cooling zone is increased, and the cooling roller speed is increased, which solves the problem of high temperature in thick plates and improves the uniformity of steel plate performance.

[0021] See also Figure 2 ,After observing the scanning pyrometer after cooling, the pyrometer showed that the temperature difference of the whole board was within 50℃, which was significantly improved compared with the previous temperature difference of 120℃.

[0022] Therefore, the technical solution of the present application adopts the method of increasing the flow rate of the collecting pipe and improving the roller speed, which effectively solves the problem of high temperature in the thick plate and improves the uniformity of the performance of the steel plate.

[0023] In addition to the above embodiments, the present invention may also have other implementation modes; any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A cooling method for improving the uniformity of water discharge from thick plates, characterized in that: include: Set the heating parameters of the slab and roll the slab after it is heated out of the furnace; Set the cooling parameters of the slab, control the steel plate to enter the cooling zone for cooling, and complete the cooling after reaching the preset red-hot temperature; Among them, the cooling parameters include cooling manifold flow rate, and several groups of cooling manifolds in the cooling zone are arranged in sequence along the moving direction of the steel plate, and the flow rate of the cooling manifold located in the front half of the cooling zone is greater than the flow rate of the cooling manifold located in the rear half of the cooling zone.

2. The cooling method for improving the uniformity of water discharge from thick plates according to claim 1, characterized in that: The flow rate of the cooling header located in the front half of the cooling zone is set to 200m 3 / h, the flow rate of the cooling header located in the second half of the cooling zone is set to 120m 3 / h.

3. The cooling method for improving the uniformity of water discharge from thick plates according to claim 1 is characterized in that: The cooling parameters also include a cooling roller speed, and the cooling roller speed is set to 1 m / s.

4. The cooling method for improving the uniformity of water discharge from thick plates according to claim 1, characterized in that: The cooling parameters also include a cooling water ratio, and the cooling water ratio is set to 1.

5.

5. The cooling method for improving the uniformity of water discharge from thick plates according to claim 1 is characterized in that: The cooling parameters also include a red-return temperature, which is set to 620±20°C.

6. The cooling method for improving the uniformity of water discharge from thick plates according to claim 1, characterized in that: The step of setting the heating parameters of the slab and rolling the slab after it is heated out of the furnace comprises: Load the slab into the heating furnace and heat it to 1133°C; After heating out of the furnace, the slab is rolled, and the rolling is completed when the steel plate thickness reaches 50 mm and the final rolling temperature reaches 820°C.

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