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Thick steel plate manufacturing method

A manufacturing method and thick steel plate technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problem of not being able to obtain uniform materials, and achieve the effects of cooling speed, cooling stop temperature, and material deviation

Active Publication Date: 2017-04-26
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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  • Thick steel plate manufacturing method
  • Thick steel plate manufacturing method
  • Thick steel plate manufacturing method

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

The objective is to provide a thick steel plate manufacturing method with which a high-quality thick steel plate with minimal variation in material quality can be obtained. This thick steel plate manufacturing method, which manufactures a thick steel plate by means of a hot-rolling process, a heated correction process, and an accelerated cooling process, in this order, is characterized by having between the heated correction process and the accelerated cooling process a descaling process in which descaling water is sprayed twice, with the total energy density of the descaling water sprayed on the surface of the thick steel plate in the two sprayings in the descaling process being 0.07 J / mm2 or greater, the second spraying of descaling water occurring no less than 0.5s after the first spraying of descaling water, and the surface temperature of the steel plate immediately before the second spraying of descaling water being no greater than the Ar3 transformation point.

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 Applications(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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