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Control method capable of obviously reducing cracks of head and tail blanks of wide and thick plate

A control method and technology for wide and thick plates, applied in the field of continuous casting in the metallurgical industry, can solve the problems such as the limited effect of crack control on the head and tail billets, and achieve the effects of shortening the product delivery cycle, improving the surface quality, and improving the incidence of surface cracks.

Pending Publication Date: 2022-04-15
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method described in this document only starts with reducing the secondary cooling of the head and tail billets, and has limited effect on the crack control of the head and tail billets.

Method used

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  • Control method capable of obviously reducing cracks of head and tail blanks of wide and thick plate
  • Control method capable of obviously reducing cracks of head and tail blanks of wide and thick plate
  • Control method capable of obviously reducing cracks of head and tail blanks of wide and thick plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment is to use the control method of the present invention to control the cracks of bridge steel Q345qE head and tail blanks.

[0036] Set the pre-flushing water 2 minutes ahead of the program before starting the pouring. After starting the pouring equipment, the casting speed will directly reach 0.4m / min, and then stabilize at 0.1m / min after 1min. 2 The acceleration is evenly increased, and the pulling speed is stable for 1 minute every time the pulling speed is increased by 0.1m / min until the normal pulling speed. Push in the special pouring powder when starting the casting, and set the vibration frequency of the crystallizer vibration table to 132Hz and the amplitude to 4.0mm when casting starts. The "red slag" operation is carried out in the tail out stage, and a small amount of water is sprinkled after the stopper is closed, and the time does not exceed 2 seconds.

Embodiment 2

[0038] This embodiment uses the control method of the present invention to control cracks in the wind power steel Q345D head and tail blanks.

[0039] Set the pre-flushing water 2 minutes ahead of the program before starting the pouring. After starting the pouring equipment, the casting speed will directly reach 0.4m / min, and then stabilize at 0.1m / min after 1min. 2 The acceleration is evenly increased, and the pulling speed is stable for 1 minute every time the pulling speed is increased by 0.1m / min until the normal pulling speed. Push in the special pouring powder when starting the casting, and set the vibration frequency of the crystallizer vibration table to 132Hz and the amplitude to 4.0mm when casting starts. The "red slag" operation is carried out in the tail out stage, and a small amount of water is sprinkled after the stopper is closed, and the time does not exceed 2 seconds.

Embodiment 3

[0041] This embodiment is to use the control method of the present invention to control the cracks of the head and tail blanks of high-strength steel Q690D.

[0042] Set the pre-flushing water 2 minutes ahead of the program before starting the pouring. After starting the pouring equipment, the casting speed will directly reach 0.4m / min, and then stabilize at 0.1m / min after 1min. 2 The acceleration is evenly increased, and the pulling speed is stable for 1 minute every time the pulling speed is increased by 0.1m / min until the normal pulling speed. Push in the special pouring powder when starting the casting, and set the vibration frequency of the crystallizer vibration table to 132Hz and the amplitude to 4.0mm when casting starts. The "red slag" operation is carried out in the tail out stage, and a small amount of water is sprinkled after the stopper is closed, and the time does not exceed 2 seconds. The head and tail blanks are arranged to be rolled into steel plates with a t...

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Abstract

The invention discloses a control method capable of obviously reducing cracks of head and tail blanks of a wide and thick plate, so that the occurrence rate of product defects is reduced, the flame cleaning amount is reduced, and the qualified rate of product quality and the market share are improved. And the control method is simple and easy to operate, additional fixed asset investment is not needed, and the cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of continuous casting in the metallurgical industry, in particular to a control method capable of significantly reducing the cracks of the head and tail blanks of wide and thick plates. Background technique [0002] In the process of starting and stopping of continuous casting, the stage of low casting speed is involved. In this stage, the cast slab surface cracks are serious and must be cleaned by flame. However, severe cases cannot be cleaned and can only be scrapped. [0003] The first pouring heat is the most unstable stage in the continuous casting process. In the early stage of casting, the water temperature and casting speed are low, the heat transfer and lubrication of the mold are unstable, and the superheat of molten steel is high, all of which affect the surface of the slab. [0004] (1) The start-up curve of the casting machine is slowly increased from 0 to the normal casting speed. The casting ...

Claims

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Application Information

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IPC IPC(8): B22D11/16B22D11/18B22D11/20
Inventor 刘志国李鑫王宏盛李文艺丁晓志
Owner BAOTOU IRON & STEEL GRP
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