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Manufacturing method of thick steel plate

A manufacturing method and technology for thick steel plates, which are applied in the directions of manufacturing tools, metal rolling, metal rolling, etc., can solve problems such as the inability to obtain uniform materials, and achieve the effect of realizing cooling speed and cooling stop temperature, and less material deviation.

Active Publication Date: 2019-01-11
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the 40μm portion, the cooling stop temperature is 40°C lower than the target temperature, and as a result, a uniform material cannot be obtained

Method used

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  • Manufacturing method of thick steel plate
  • Manufacturing method of thick steel plate
  • Manufacturing method of thick steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Hereinafter, examples of the present invention will be described. In the following description, the temperature of the steel plate is the temperature of the surface of the steel plate.

[0095] use as Figure 4 The production equipment of the thick steel plate shown manufactures the thick steel plate of this invention. After the slab is reheated in the heating furnace 1 , the primary scale is removed in the descaling device 2 , hot rolled by the rolling mill 3 , and the shape is straightened by the shape straightening device 4 . After the shape was straightened, descaling was carried out. Regarding descaling after thermal straightening, in the case of two descaling devices, two descaling devices 6 and 7 are arranged, and descaling is performed on the surface of the thick steel plate twice. In addition, when descaling is performed 3 times or more, descaling apparatuses are arrange|positioned in 3 rows or more, and each nozzle row is separated by 500 mm or more in the ...

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Abstract

An object of the present invention is to provide a method for manufacturing a thick steel plate capable of ensuring a high-quality thick steel plate with little material variation. A method for manufacturing a thick steel plate, wherein, in the method for manufacturing a thick steel plate by sequentially performing a hot rolling step, a hot straightening step, and an accelerated cooling step, there is a step of descaling between the hot straightening step and the accelerated cooling step. In the descaling process, the descaling water is sprayed twice, and in the descaling process, the energy density of the descaling water sprayed on the surface of the thick steel plate is set to a total of 0.07J / mm2 for the two sprays In the above, the second descaling water is sprayed 0.5s or more after the first descaling water spray, and the steel plate surface temperature immediately before the second descaling water spray is set as the Ar3 transformation point the following.

Description

technical field [0001] The present invention relates to a method for manufacturing thick steel plates. Background technique [0002] In the process of manufacturing thick steel plates by hot rolling, the application of controlled cooling is gradually expanding. For example, if figure 1 As shown, after the thick steel plate (not shown) is reheated by the heating furnace 1 , the thick steel plate is descaled in the descaling device 2 . Then, after the thick steel plate is rolled by the rolling mill 3 , it is straightened by the shape straightening device 4 , and thereafter, controlled cooling by water cooling or air cooling is performed in the accelerated cooling device 5 . It should be noted that the arrows in the figure indicate the traveling direction of the thick steel plate. [0003] It is known that in the case of water-cooling a thick steel plate by an accelerated cooling device, such as figure 2 As shown, since the scale on the surface of the thick steel plate bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B45/08B21B1/38B21B45/02
CPCB21B1/38B21B45/02B21B45/08B21B45/06B21B37/74B21B2261/20
Inventor 田村雄太安达健二
Owner JFE STEEL CORP
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