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Cooling facility and cooling method of steel plate

A technology of cooling equipment and cooling method, which is applied in the direction of workpiece cooling device, metal processing equipment, workpiece surface treatment equipment, etc., and can solve problems such as uneven temperature, product material, adverse effects of shape, uneven cooling, etc.

Active Publication Date: 2008-08-27
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the technology described in Japanese Patent Application Laid-Open No. 55-106615, the steel plate is cooled by a shower cooling device, but the cooling water dehydration (damming of remaining water) is not considered, so there is the following problem: In order to obtain the specified When a large flow of cooling water is supplied to the upper surface of the steel plate due to the temperature drop, the cooling water remaining on the upper surface of the steel plate moves freely on the upper surface of the steel plate, and the cooling area of ​​the steel plate changes, resulting in uneven cooling, which affects the product. adverse effects on the material and shape of the
Therefore, if the cooling water film 53 is not formed well, the cooling water leaks to the upstream and downstream directions of the injection area, and it stagnates on the steel plate 10 to partially cool the steel plate 10, and there is a problem of uneven temperature.
There is also a technique to remove the cooling water remaining on the upper surface of the steel plate 10 with a side sprayer, but it cannot be completely removed when there is a large amount of cooling water, and there is still a problem of uneven temperature

Method used

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  • Cooling facility and cooling method of steel plate
  • Cooling facility and cooling method of steel plate
  • Cooling facility and cooling method of steel plate

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Experimental program
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Effect test

no. 1 approach

[0091] FIG. 1 is a layout diagram of a hot rolling facility for steel sheets in one embodiment of the present invention. As shown in FIG. 1 , in this embodiment, a heating furnace 11 , a reversing rolling mill 12 , and cooling equipment 20 located near the entrance (upstream side) and exit (downstream side) of the reversing rolling mill 12 are arranged. Cooling equipment (also referred to as cooling unit) 20 is a pass-through cooling equipment, as shown in Figure 2, has an upper water tank unit 21 for supplying cooling water to the upper surface of steel plate 10 and a water tank unit 21 for supplying cooling water to the lower surface of steel plate 10. The lower water tank 31 of water. Wherein, in Fig. 1 and Fig. 2, 13 is a table roller.

[0092] 3 and 16 are detailed views of the cooling device 20 . Wherein, in FIG. 3, the cooling device 20 is arranged between the reversing rolling mill 12 and the side guide plate 14. In FIG. 12 position. In either case, the cooling dev...

no. 2 approach

[0127] The steel plate cooling equipment in the second embodiment of the present invention, in the first embodiment shown in FIG. 0 to 35% of the steel sheet becomes a component facing outward in the width direction of the steel sheet.

[0128] As shown in FIG. 6 and FIG. 7, when the injection directions of the rod-shaped cooling water 23a and 23b are set so that 0 to 35% of the velocity components in the injection direction of the rod-shaped cooling water 23a and 23b become the velocity components toward the outside in the width direction of the steel plate, As shown by arrow A in FIGS. 6 and 7 , the cooling water sprayed from the upper nozzles 22 a and 22 b to the upper surface of the steel plate 10 merges and falls rapidly from the width end of the steel plate 10 . Therefore, compared with the case where there is no velocity component toward the outer side in the width direction of the steel sheet, the stagnant cooling water 24 can be intercepted and dewatered with a smalle...

no. 3 approach

[0141] In the above-mentioned first embodiment, when the speed of the rod-shaped cooling water 23a, 23b sprayed from the opposing upper nozzles 22a, 22b is fast, for example, 10 m / s or more, the rod-shaped cooling water 23a, 23b and the steel plate 10 After colliding, they collide with each other and fly upwards. There is no problem if the scattered cooling water falls on the stagnant cooling water 24. However, as shown in FIG. The clearance between the cooling water 23a, 23b leaks, and complete water removal cannot be performed. This problem is particularly likely to occur when the stagnation region length L is within 200 mm. In addition, when the injection speed of the cooling water is fast, the scattered cooling water 24 may fly over the header tanks 21 a and 21 b and fall onto the steel plate 10 .

[0142] In this regard, the cooling device of the third embodiment replaces the cooling unit 20 of FIG. 1 used in the first embodiment. As shown in FIG. 9, a side view is show...

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Abstract

Cooling facility and method of a steel plate for cooling the steel plate properly on a hot rolling line by a compact structure when controlled rolling of the steel plate is performed. The cooling facility of a steel plate, which is a cooling facility for supplying cooling water to the upper and lower surfaces of the steel plate (10) while passing the steel plate (10) when it is hot rolled, has nozzles (22a, 22b) for supplying cooling water obliquely toward the upper surface of the steel plate (10) from above, wherein the nozzles (22a, 22b) are arranged such that ejections of cooling water on the steel plate (10) oppose each other in the carrying direction of the steel plate (10). More concretely, it is a passing type cooling facility (20) having a large water volume density of 4 m<3> / m<2>min or above.

Description

technical field [0001] The present invention relates to cooling equipment and a cooling method for steel plates. Background technique [0002] In recent years, in the hot rolling of steel plates, the production of steel plates with excellent strength and toughness is required. As an example, by performing controlled rolling (CR) on rolled steel materials, thick steel plates (steel plates) with excellent materials are produced. . That is, a slab heated to 1000°C or higher is temporarily rolled to a predetermined thickness, and then the rolled steel is at a temperature in the non-recrystallization temperature range (non-recrystallization temperature range) or near the temperature range Rolled in the state of the area to the final plate thickness. For example, after heating a steel slab with a thickness of 200 to 300mm to about 1100 to 1200°C, rolling to about 1.5 to 2 times the final plate thickness, and then starting when the temperature falls below 850°C which is the non-r...

Claims

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Application Information

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IPC IPC(8): B21B45/02
CPCB21B45/0218B21B37/44B21B45/02
Inventor 中田直树黑木高志藤林晃夫富田省吾堀江正之西田俊一平田直人佐藤道夫石田匡平
Owner JFE STEEL CORP
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