The Method of Controlling Center Line Cracks in Steel Plate Continuous Casting Process

A continuous casting process and control center technology, applied in the field of metallurgical processes, can solve the problems of not eliminating centerline cracks, not pointing out continuous casting and rolling production, and inability to reduce other cracks, etc. Even cooling effect

Active Publication Date: 2017-05-24
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, this method can only reduce the generation of hydrogen-induced cracks, and cannot reduce the generation of other cracks
And the patent literature does not point out whether the method is applicable to the continuous casting and rolling production of other steel plates
[0006] In summary, in the existing steel plate continuous casting process, there is no method to eliminate the centerline cracks as a whole, and it is impossible to eliminate the centerline cracks in the finished steel plate after continuous casting and rolling as much as possible.

Method used

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  • The Method of Controlling Center Line Cracks in Steel Plate Continuous Casting Process

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Experimental program
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Embodiment 1

[0046] The raw material of molten steel used in this embodiment is a set of 10 furnaces of Q235B plain carbon molten steel. The size of the cast billet produced is 1500mm*230mm*long. The molten steel is treated with impurities before the molten steel is cast before the molten steel enters the converter. Carry out desulfurization treatment to ensure that the S content of the molten iron entering the converter is 0.018wt%, and the slag is fully removed; the top and bottom composite blowing smelting of the molten iron is used in the converter to ensure that the P content of the molten steel is 0.018wt% and the C content is 0.08wt% .

[0047] Before continuous casting of molten steel, check the atomization nozzles in the sector section for inspection. It is found that the atomization nozzles in the foot roller section and the zero section are not clogged, the arc section is blocked by 2, the horizontal section is blocked by 4, and the water supply There is no leakage in the pipeline....

Embodiment 2

[0052] The raw material of molten steel used in this embodiment is a set of 12 furnaces of Stb32 low-carbon aluminum killed steel, and the size of the produced cast slab is 1820mm*230mm*long; the molten steel is treated for impurity removal before the molten steel is cast, and the molten iron enters the converter Prior to desulfurization treatment, ensure that the S content of molten iron entering the converter is 0.008wt%, and fully slag off; in the converter, the molten iron is smelted by top-bottom combined blowing to ensure that the molten steel has a P content of 0.008wt% and a C content of 0.05wt %.

[0053] Before continuous casting of molten steel, check the atomization nozzles in the sector section. It is found that there is no blockage of the atomization nozzles in the foot roller section and the zero section, the number of blocked atomization nozzles in the arc section is 1, the number of blocked atomization nozzles in the horizontal section is 3, and the water supply ...

Embodiment 3

[0058] The raw material of molten steel used in this embodiment is a set of 12 furnaces of Stb32 low-carbon aluminum killed steel, and the size of the cast slab produced is 1820mm*230mm*long; the molten steel is treated for impurity removal before the molten steel is cast before the molten steel enters the converter. Desulfurization treatment is carried out before, to ensure that the S content of the molten iron entering the converter is 0.012wt%, and the slag is fully removed; the top and bottom composite blowing smelting of the molten iron is used in the converter to ensure that the P content of the molten steel is 0.012wt% and the C content is 0.06wt %.

[0059] Before continuous casting of molten steel, check the atomization nozzles in the sector section for inspection. It is found that the atomization nozzles in the foot roller section and the zero section are not clogged, the number of blocked atomization nozzles in the arc section is 0, the number of blocked atomization noz...

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Abstract

The invention discloses a method for preventing generation of center line cracks in the steel board continuous casting process. The method comprises the four steps of checking and maintaining a water cooling system before molten steel is continuously cast, removing impurities for the molten steel before the molten steel is continuously cast, performing mist cooling on a continuously cast billet in a fan-shaped section, and decreasing the pulling speed of the continuously cast billet in the fan-shaped section step by step. The method can improve the quality of a continuously cast steel board, reduce the manufacturing loss of the continuously cast steel board and reduce the manufacturing cost of the steel board.

Description

Technical field [0001] The invention relates to the technical field of metallurgical technology, in particular to a method for controlling centerline cracks in a steel plate continuous casting process. Background technique [0002] Cracks are a serious continuous casting defect. Among them, the linear crack in the center of the cross section of the continuous casting is a centerline crack. Centerline cracks are often accompanied by centerline segregation and enrichment of non-metallic inclusions. After continuous castings are finished, they are not easy to weld, which seriously affects the product quality of continuous castings. Continuous castings with centerline cracks require centerline cracks. Partial removal, if the continuous casting has more centerline cracks, the whole continuous casting may be scrapped. The steel plate continuous casting process is a process in which centerline cracks increase. Among them, the continuous casting process of the continuous caster segmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/16B22D11/22
CPCB22D11/16B22D11/225
Inventor 彭和平
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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