Method for extending rolled on-line quenching cooling region to cooling bed

A technology of cooling area and cooling bed, which is applied in the field of quenching in the field of metal heat treatment technology, can solve the problems of insufficient quenching cooling interval, inconsistent quenching cooling intensity and quenching cooling time, achieve consistent cooling effect, avoid quenching and cooling conditions, and solve the problem of cooling Effects of Insufficient Intervals

Inactive Publication Date: 2009-07-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies and defects of the prior art, the present invention proposes a method of extending the on-line quenching and cooling area after rolling to the cooling bed. On the premise of utilizing the space reserved between the existing finishing mill and the cooling bed, the quenching The cooling zone is extended to the cooling bed area to solve the problem of insufficient quenching and cooling zone, and at the same time solve the problem of inconsistent quenching and cooling strength and quenching and cooling time of each part of the steel on the cooling bed

Method used

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  • Method for extending rolled on-line quenching cooling region to cooling bed

Examples

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Effect test

Embodiment 1

[0015] The processed product object of this example is H-beam. The size of H-beam is 338mm in height, 323mm in width, and the thickness of flange and web is 30.5mm. The movement speed of H-beam on the roller table after finishing rolling is 3m / s.

[0016] First, 6 sets of quenching and cooling covers are set between the 9m-long quenching and cooling space between the finishing mill and the cooling bed, and the mutual spacing is 1.5m. The quenching and cooling covers are designed according to the shape of H-shaped steel. It is composed of an upper spray cover, a lower spray cover, a left spray cover and a right spray cover. In order to ensure that the H-shaped steel passes through the quenching and cooling cover smoothly on the roller table, the left water spray cover and the right water spray cover are parallel to the flange of the H-shaped steel, and are about 100mm away from the outer surface of the H-shaped steel flange. The distance between the water spray surface and the ...

Embodiment 2

[0021] The processed product object of this example is steel rail, the model is 110 rail, and the movement speed on the roller table after finishing rolling is 3m / s.

[0022] First, 8 sets of quenching and cooling covers are set between the two roller tables with a 12m long reserved quenching and cooling space between the finishing mill and the cooling bed. The mutual spacing is 1.5m. The quenching and cooling covers can be designed according to the shape of the rail. The cover is made up of an upper spray cover, a lower spray cover, a left side spray cover and a right side spray cover.

[0023] In order to ensure that the rail passes through the quenching and cooling cover smoothly on the roller table, the left water spray cover and the right water spray cover are parallel to the side of the rail, and are respectively about 100mm away from the side of the rail. The size of the roller is 300mm, and the water spray surface of the lower spray cover is about 50mm lower than the r...

Embodiment 3

[0027] The product to be processed in this example is a steel plate. Firstly, a quenching and cooling cover is set between each pair of roller tables in the reserved quenching and cooling space between the finishing mill and the cooling bed. The quenching and cooling cover is composed of an upper water spray cover and a lower water spray cover. , the left spray cover and the right spray cover. The left water spray cover and the right water spray cover are parallel to the sides of the steel plate and are used for quenching and cooling the two sides of the steel plate. The upper water spray cover is used for quenching and cooling of the upper surface of the steel plate, and the lower water spray cover is used for quenching and cooling of the lower surface of the steel plate. The upper spray cover, the lower spray cover, the left spray cover and the right spray cover are respectively connected with an independent water supply pipeline through pipelines and valves.

[0028] The s...

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Abstract

The invention relating to the branch of material thermal treatment technology discloses a method of extending an after-rolling on-line quenching cooling space to the cooling table.According to the invention, a quenching cooling cover for rolled steel is designed at a reserved space between a finishing mill and a cooling table, a quenching cooling interval length of the cooling table is determined according to the requirements of the velocity of movement of the roll table and the quenching time, the quenching cooling interval of the cooling table is divided into at least one quenching cooling cover of the cooling table, one or more quenching cooling covers of the cooling table are provided between each two roll tables, at the same time that rolled steel moving on the cooling table is stopped, a control system stops the water-spraying of the quenching cooling covers on the cooling table one by one according to a sequence direction opposite to the moving direction of the rolled steel and the moving speed of the rolled steel after precision rolling, therefore, cooling times of all the parts in the length direction of the rolled steels are accordant.According to the invention, problems that a reserved space between a finishing mill and a cooling table is skimpy and the quenching and cooling of each part of the rolled steels on the cooling table is not uniform are both solved.

Description

technical field [0001] The invention relates to a quenching method in the technical field of metal heat treatment, in particular to a method for extending the on-line quenching cooling area to a cooling bed after rolling. Background technique [0002] Quenching refers to heating the steel to A C3 or A C1 A certain temperature above the point, keep it for a certain time, and then cool at an appropriate speed to obtain the heat treatment process of the desired structure. In order to save energy and improve the mechanical properties of steel after rolling, the process of quenching and self-tempering on-line after rolling is adopted. The advantage of on-line quenching and self-tempering after rolling is that the surface temperature of the steel can be rapidly reduced by controlling the quenching and cooling intensity and time after rolling to obtain martensite or bainite, and then the quenching and cooling process can be completed by using the internal heat transfer of the ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/84
Inventor 陈乃录左训伟徐骏张幸
Owner SHANGHAI JIAO TONG UNIV
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