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Method for improving cooling uniformity of casting blank

A technology for uniform cooling and casting billets, which is applied to casting equipment, the configuration of indicating equipment/measuring equipment, and manufacturing tools. The effect of improving harsh environment, improving billet quality and improving uniformity

Active Publication Date: 2022-07-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the air-mist cooling mode is adopted in the secondary cooling zone of continuous casting. The influence of this mode on the cooling uniformity of the slab has the following problems: (1) The installation of the air-mist nozzle is more complicated, and the farther it is from the center of the nozzle, its The smaller the injection amount, the uneven cooling process is likely to be caused; (2) Due to the existence of guide rollers in the secondary cooling zone of the continuous casting machine, the inner arc side of the slab is likely to cause the accumulation of cooling water, which invisibly causes the cooling intensity of the inner and outer arcs of the slab Unevenness; (3) Due to water quality problems in the use of air mist nozzles, nozzle openings are prone to clogging, resulting in uneven cooling of the slab
The spray surface of the air mist nozzle is generally symmetrical fan-shaped or rectangular. After reducing the spray flow rate at the corner, it will also reduce the cooling amount of the air mist adjacent to the symmetrical surface of the corner, thus affecting the cooling uniformity of the entire cross-section.

Method used

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  • Method for improving cooling uniformity of casting blank
  • Method for improving cooling uniformity of casting blank
  • Method for improving cooling uniformity of casting blank

Examples

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Embodiment 1

[0044] This embodiment is carried out in a 45# steel continuous casting workshop of a certain factory, and the continuous casting parameters are:

[0045] The superheat degree of the middle bag is 30℃, the section size is 220mm×220mm, and the casting machine is a billet continuous casting machine, and the pulling speed is 1.0m / min.

[0046] The cooling method is as follows: gas cooling is adopted, 2 rectangular nozzles 4.1 are arranged on one side, and 4 circular nozzles 4.2 are arranged on each corner of the single side, for a total of 8 circular nozzles 4.2. The air pressure of the rectangular nozzle 4.1 is set to 0.5MPa, and the four circular nozzles 4.2 at the corners are set to 0.2-0.1-0.05-0.05MPa in turn from the inside to the outside. The diameter of the cross section of the circular nozzle 4.2 is 10mm; the length of the cross section of the rectangular nozzle 4.1 is 20mm and the width is 10mm; They are arranged in order from the corners of the billet inwards.

Embodiment 2

[0054] This example is carried out in a Q335B steel continuous casting workshop of a certain factory, and the continuous casting parameters are:

[0055] The superheat degree of the middle bag is 25℃, the continuous casting machine of 200×1000mm slab, the pulling speed is 0.70m / min.

[0056] Cooling method: gas cooling, 10 rectangular nozzles 4.1 are arranged on the wide surface, 6 circular nozzles 4.2 are arranged at the corners of the wide surface, the nozzle is 80mm away from the surface of the slab, and the nozzle spacing in the same row is 70mm; 1 rectangular nozzle 4.1 is arranged on the narrow surface , 4 circular nozzles 4.2 are arranged at the corners of the narrow face, and the nozzle is 90mm away from the surface of the slab. The diameter of the cross-section of the circular nozzle 4.2 is 11 mm; the length of the cross-section of the rectangular nozzle 4.1 is 22 mm and the width is 11 mm; the air pressure of the wide nozzle is set to 0.6 MPa, and the air pressure of...

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Abstract

The invention belongs to the technical field of continuous casting in the metallurgical industry, and particularly relates to a method for improving the cooling uniformity of a casting blank. And high-pressure and low-temperature inert gas is used in the secondary cooling chamber for cooling the high-temperature casting blank. Due to implementation of gas cooling, the severe environment of the secondary cooling chamber is greatly improved, and it is possible to track changes of the surface temperature of a casting blank in the secondary cooling chamber of the casting machine. By setting the type and the arrangement mode of the gas nozzles, the cooling gas amount of the corners of the casting blank can be independently adjusted without influencing the cooling jet flow amount of adjacent positions, and the temperature drop of the corners of the casting blank can be greatly reduced, so that the cooling uniformity of the cross section of the casting blank is improved. And meanwhile, high-temperature temperature measuring equipment is adopted for measuring the temperatures of different positions of the casting blank, and the gas injection amount of nozzles at different positions is adjusted in real time through temperature feedback. After the method is adopted, the cooling uniformity of the casting blank can be further improved, and the quality of the casting blank is improved.

Description

technical field [0001] The invention relates to the technical field of continuous casting in the metallurgical industry, in particular to a method for improving the cooling uniformity of a slab. Background technique [0002] With the continuous development of the steel industry, downstream customers have higher and higher requirements for the quality of steel products. Continuous casting is the connection process between steelmaking and rolling, and the quality of the cast slabs it produces directly affects the final properties of the products. [0003] Continuous casting is a process in which liquid molten steel is continuously cooled and solidified. Whether the cooling is uniform or not is directly related to the quality of the slab. At present, the second cooling zone of continuous casting adopts the gas mist cooling mode. The influence of this mode on the cooling uniformity of the slab has the following problems: (1) The installation of the gas mist nozzle is more com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/22B22D11/124B22D2/00
CPCB22D11/225B22D11/1246B22D2/00
Inventor 包燕平张孟昀
Owner UNIV OF SCI & TECH BEIJING