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Hot-rolled steel sheet cooling device, and hot-rolled steel sheet cooling method

A hot-rolled steel plate and cooling device technology, which is applied in the direction of workpiece cooling device, length measuring device, quenching device, etc., can solve the problem of increasing cooling non-uniformity, expanding non-uniformity of steel plate temperature distribution, and difficult control of steel plate temperature, etc. problem, to achieve the effect of improving uniformity

Active Publication Date: 2021-04-23
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the non-uniformity of cooling increases, and the non-uniformity of the temperature distribution of the steel plate tends to expand rapidly.
Therefore, it becomes difficult to control the temperature of the steel sheet, and it becomes difficult to cool the entire steel sheet at the target coiling temperature.

Method used

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  • Hot-rolled steel sheet cooling device, and hot-rolled steel sheet cooling method
  • Hot-rolled steel sheet cooling device, and hot-rolled steel sheet cooling method
  • Hot-rolled steel sheet cooling device, and hot-rolled steel sheet cooling method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0064] figure 1 It is an explanatory diagram showing a schematic configuration of a manufacturing apparatus (hereinafter referred to as "hot rolling facility") 10 including a cooling device for manufacturing a hot-rolled steel sheet according to the first embodiment of the present invention.

[0065] Such as figure 1 As shown, in the hot rolling equipment 10, the heated slab 1 is continuously rolled by rollers sandwiching it up and down, and it is rolled to a minimum thickness of about 1mm to make a hot-rolled steel plate 2 and then hot-rolled the steel plate 2. 2 rolls. The hot rolling facility 10 includes a heating furnace 11 for heating a slab 1, a width direction rolling machine 12 for rolling the slab 1 heated in the heating furnace 11 along the width direction of the slab, The slab 1 rolled in the width direction is rolled to form a rough slab 13, the rough slab is further continuously hot-rolled to a predetermined thickness, and the finish rolling mill 14 is cooled ...

no. 2 Embodiment approach

[0154] Figure 16 It is a figure which schematically shows a part of structure of the upper side cooling apparatus 16 of 2nd Embodiment.

[0155] The upper side cooling device 16 of this embodiment has the configuration of the upper side cooling device 16 of the first embodiment, and also includes a dewatering nozzle 40 as shown in the figure.

[0156] One dewatering nozzle 40 is provided for each of the area on one side and the area on the other side in the width direction of the cooling width area. In addition, the dewatering nozzle 40 is arranged on the outside of the width direction of the cooling width region, and the dewatering nozzle 40 is arranged on the outside of the other side of the width direction for the region on one side of the width direction, and the region on the other side of the width direction The dewatering nozzle 40 is provided outside on one side in the width direction.

[0157] These dewatering nozzles 40 spray dewatering water to the area downstrea...

Embodiment 1 and comparative example 1

[0184] In the verification of the effect, in Example 1, use figure 1 The cooling device including the main cooling device 15, the upper side cooling device 16, and the cooling device 17 for adjustment performed cooling. In addition, in Comparative Example 1, cooling was performed using a cooling device including the main cooling device 15 and the cooling device 17 for adjustment instead of the upper side cooling device 16 . In Example 1 and Comparative Example 1, the cooling in the main cooling device 15 is performed by feedback control based on the measurement results of a temperature sensor (not shown) provided on the downstream side of the main cooling device 15, and the cooling device 17 for adjustment Cooling is similarly performed by feedback control based on a measurement result of a temperature sensor (not shown) provided on the downstream side of the adjusting cooling device 17 .

[0185] In addition, in Example 1 and Comparative Example 1, the steel plate width: 16...

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PUM

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Abstract

This cooling device is provided with, for each of a plurality of divided cooling surfaces, a cooling water nozzle (23) and a switching device for switching between impact and non-impact of cooling water sprayed from the cooling water nozzle (23) onto the divided cooling surface, wherein the divided cooling surfaces are cooling regions obtained by dividing an entire cooling region into a plurality of regions in the steel sheet conveying direction and into at least three regions in the width direction. The cooling device is further provided with a control device for controlling the operation of the switching devices on the basis of a width-direction temperature distribution. The cooling water nozzles (23) each have a spray axis (P) that is inclined with respect to a line perpendicular to the entire cooling region as seen from the steel sheet conveying direction, and after impacting the divided cooling surface, the cooling water is directed to the opposite side from the corresponding cooling water nozzle (23) in the width direction.

Description

technical field [0001] The present invention relates to a cooling device for cooling an upper surface of a hot-rolled steel sheet conveyed on conveying rolls after hot rolling, and a cooling method using the cooling device. Background technique [0002] With the reduction in weight of automobiles in recent years, the demand for high-tensile steel sheets among hot-rolled steel sheets has increased, and the quality required for hot-rolled steel sheets has further improved. In particular, in recent years, not only high strength is simply pursued, but also excellent formability such as press formability and hole expandability are simultaneously pursued, and the deviation of mechanical properties such as tensile strength and formability is controlled within a predetermined range in the entire area of ​​the steel plate. Inside and so on. [0003] In the manufacturing process of a hot-rolled steel sheet, the coiling temperature is one of the factors that largely affect the propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02
CPCB21B45/0218B21B37/76B21B45/0233B21B38/006C21D11/005C21D1/667C21D1/60C21D9/573C21D9/46C21D8/0263B21B39/14B21B37/74
Inventor 仁井谷洋林伸匡松本瑠美芹泽良洋宝诸知史丑泽拓梦加藤菜绪子
Owner NIPPON STEEL CORP