Device and method for controllably cooling thick steel plate

A technology for controlling cooling and controlling devices, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of uneven cooling, difficult production, deformation, etc., and achieve the effect of good material uniformity

Inactive Publication Date: 2006-07-12
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when accelerated cooling is performed, uneven cooling tends to occur in the steel plate, causing problems such as material dispersion and deformation, which makes efficient mass production difficult.

Method used

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  • Device and method for controllably cooling thick steel plate
  • Device and method for controllably cooling thick steel plate
  • Device and method for controllably cooling thick steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] use has figure 2 The control cooling device for the thick steel plate with the basic structure shown in the figure controls the amount of ferrite formed in the slow cooling zone, and then rapidly cools it in the rapid cooling zone to produce a thick steel plate with a small difference in hardness between the surface and the center . The basic specifications of the equipment, the characteristics of the processed materials, and the processing mode are shown in Table 1.

[0071] Table 2 shows the results of comparing the operation results of the controlled cooling according to the present invention (invention examples 1 to 3) with those of the comparative examples. Among them, Comparative Example 1 is the case of using only a cooling device with a quenching zone, and Comparative Example 2, as shown in Patent Document 1, is in Ar 3 Above temperature, Ar 3 End rolling at a temperature below +50°C, and set the cooling start temperature to Ar 3 Below temperature, Ar 3 An...

Embodiment 2

[0075] A low-yield-ratio steel plate was manufactured using the same controlled cooling device as that used in Example 1. The characteristics and processing modes of the processed materials are shown in Table 3.

[0076] Table 4 shows the operation results of controlled cooling according to the present invention (invention examples 4 to 5) and comparative examples. Among them, Comparative Example 4 is to make the thick steel plate stand by, and let it cool to Ar 3 After the phase transition point is 740°C, it is cooled to about 450°C in the quench zone. Comparative example 5 is the case of cooling to about 450 degreeC only in an annealing zone based on patent document 3. Comparative Example 6 is based on Patent Document 4, after being cooled by slow cooling zone, it is reheated to Ar 3 Below -20℃, Ar 3 After the range of -100°C or higher (640°C to 720°C in this example), it is cooled to about 450°C in the quenching zone. In Comparative Example 7, the steel was cooled to a...

Embodiment 3

[0078] Using the same device as the controlled cooling device used in Example 1, the temperature at the exit side of the slow cooling zone was measured, and based on this value, the cooling conditions of the rapid cooling zone were changed to perform controlled cooling of the thick steel plate. The characteristics and processing conditions of the processed materials are shown in Table 5.

[0079] Table 6 shows the comparison between the actual results of the operating parameters and the existing operating parameter targets when the temperature at the exit side of the slow cooling zone is measured in the above operation, and the cooling conditions of the rapid cooling zone are changed based on this value to perform controlled cooling of thick steel plates the result of. In Inventive Example 6, the actual cooling stop temperature in the annealing zone was about 40°C higher than the target. Therefore, when cooling is carried out at the plate passing speed of the quenching zone o...

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Abstract

A device for controllably cooling a thick steel plate capable of suppressing the occurrence of a difference in the hardness of the thick steel plate between the surface and the center thereof without lowering rolling efficiency and efficiently mass-producing the thick steel plate with low yield ratio, wherein a gentle cooling zone in which steel structure is partially transformed into ferrite is disposed on the outlet side of a rolling machine and a rapid cooling zone in which the remaining austenite is transformed into perlite, bainite, and martensite is disposed on the rear side of the gentle cooling zone. Namely, the gentle cooling zone and the rapid cooling zone controllable independently of each other are disposed in that order.

Description

technical field [0001] The invention relates to a cooling device for a thick steel plate, in particular to a thick steel plate which can be uniformly cooled at a faster rate and has good material uniformity in the thickness direction of the thick steel plate, and can be stably A cooling device and a controlled cooling method for producing thick steel plates with low yield ratio thick steel plates. Background technique [0002] In the manufacture of thick steel plates, in order to ensure the required mechanical properties of the steel plate, especially its strength and toughness, controlled cooling is carried out after rolling. When controlling cooling, from the perspective of high strength and high toughness, the cooling rate is mostly made faster. However, in such a controlled cooling material that accelerates the cooling rate, since the cooling rate of the surface layer of the thick steel plate is higher than the cooling rate of the central part in the thickness direction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02
Inventor 上冈悟史井原健滋西崎宏西田俊一弓削佳德
Owner JFE STEEL CORP
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