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Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate

A technology for controlling cooling and steel plates, applied in metal processing equipment, temperature control, heat treatment equipment, etc., can solve problems such as overcooling and increasing water volume

Inactive Publication Date: 2006-07-19
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in some cooling devices, overcooling due to the boiling phenomenon described above can occur
On the other hand, water accumulated on the upper surface of the steel plate falls from the edge, thereby increasing the amount of water passing through the edge, thus causing excessive cooling

Method used

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  • Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate
  • Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate
  • Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate

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[0163] Table 1 shows the working conditions of the controlled cooling according to the present invention and the controlled cooling according to the existing method (comparative example). Table 2 shows the comparison between the effects of the above two methods. The condition of the processed steel plate is described as follows: the thickness of the steel plate is 25 mm, the width is 3,800 mm, and the length used is 25 m. Controlled cooling started from a temperature of 750°C at the middle of the steel sheet along the width direction and ended at 550°C. The strength of the steel plate is 490MPa level. Its allowable range is 490-610MPa. before cooling, in Figure 9 Among them, the temperature drop at each edge of the steel plate along the width direction is 30°C, and the temperature drop distance at each edge of the steel plate along the width direction is 200mm. exist Figure 14 , the temperature drop at each of the top and tail ends of the steel plate along the longitudi...

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Abstract

A controllable cooling method for a hot rolled thick steel plate, a thick steel plate manufactured by the controllable cooling method, and a cooling device for the thick steel plate. Specifically, the controllable cooling method for the thick steel plate, the method wherein the temperature distribution of the thick steel plate in the lateral direction is uniformized before or at the beginning of the controllable cooling, and the entire part of the thick steel plate in the lateral direction is cooled by the controllable cooling device at a same cooling rate.

Description

technical field [0001] The present invention relates to a controlled cooling system (accelerated controlled cooling system) for a steel plate after completion of hot rolling, a steel plate produced by the accelerated controlled cooled system, and cooling equipment. Background technique [0002] In steel sheet production, in order to secure mechanical properties, specifically, strength and rigidity, in some cases, steel sheets are subjected to controlled cooling with a high cooling rate after rolling. Controlled cooling is a technique for obtaining a material having targeted mechanical properties and the like by rapidly cooling a steel sheet in the transformation range from austenite to ferrite after hot rolling in order to control and adjust the transformation structure and the crystal structure of the steel. Furthermore, in order to ensure uniformity of material along the entire steel plate and to prevent strain in the steel plate after cooling, the entire surface of the st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02B21B37/76C21D1/667C21D9/46C21D11/00
CPCB21B37/76C21D1/667C21D9/573B21B45/0218C21D9/46C21D11/005B21B45/0215
Inventor 上冈悟史井原健滋弓削佳德
Owner JFE STEEL CORP
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