Method for preventing generation of center line cracks in steel board continuous casting process

A technology of continuous casting process and control center, which is applied in the field of metallurgical technology, can solve the problems of not pointing out continuous casting and rolling production, not eliminating center line cracks, and not reducing other cracks, etc., to achieve large water spray coverage, reduce molten steel flow, Uniform cooling effect

Active Publication Date: 2016-03-09
攀钢集团西昌钢钒有限公司
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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 plate

Method used

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  • Method for preventing generation of center line cracks in steel board continuous casting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The raw material of molten steel used in this example is a group of 10 furnaces of Q235B ordinary carbon steel molten steel. The size of the cast slab produced is 1500mm*230mm*long. Carry out desulfurization treatment to ensure that the S content of molten iron entering the converter is 0.018wt%, and fully remove slag; adopt top-bottom composite blowing smelting for molten iron in the converter to ensure that the P content of molten steel is 0.018wt%, and the C content is 0.08wt% .

[0047] Before continuous casting of molten steel, inspect the atomizing nozzles in the fan-shaped section and find that there is no blockage in the foot roll section and zero section atomizing nozzles, the number of blocked atomizing nozzles in the arc section is 2, the number of blocked atomizing nozzles in the horizontal section is 4, and the water supply There are no leaks in the pipeline.

[0048] During continuous casting of molten steel, turn on the high-pressure water source, and sp...

Embodiment 2

[0052] The raw material of molten steel used in this example is a group of 12 heats of Stb32 low-carbon aluminum killed steel, and the size of the cast slab produced is 1820mm*230mm*long; Desulfurization treatment is carried out before the furnace to ensure that the S content of the molten iron entering the converter is 0.008wt%, and the slag is fully removed; the molten iron is smelted by top-bottom composite blowing in the converter to ensure that the P content of the molten steel is 0.008wt%, and the C content is 0.05wt% %.

[0053] Before continuous casting of molten steel, check the atomizing nozzles in the fan-shaped section for inspection. It is found that there is no blockage in the foot roll section and the zero section atomizing nozzles, the number of blocked atomizing nozzles in the arc section is 1, and the number of blocked atomizing nozzles in the horizontal section is 3. There are no leaks in the pipeline.

[0054] During continuous casting of molten steel, turn ...

Embodiment 3

[0058] The raw material of molten steel used in this example is a group of 12 heats of Stb32 low-carbon aluminum killed steel, and the size of the cast slab produced is 1820mm*230mm*long; Desulfurization treatment is carried out before the furnace to ensure that the S content of the molten iron entering the converter is 0.012wt%, and the slag is fully removed; the molten iron is smelted by top-bottom composite blowing 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 atomizing nozzles in the fan-shaped section for inspection. It is found that there is no blockage in the foot roll section and the zero section atomizing nozzles, the number of blocked atomizing nozzles in the arc section is 0, the number of blocked atomizing nozzles in the horizontal section is 2, and the water supply There are no leaks in the pipeline.

[0060] During continuous casting of ...

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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 the generation of centerline cracks in the steel plate continuous casting process. Background technique [0002] Cracks are a serious continuous casting defect. Among them, the linear cracks in the center of the cross-section of the continuous casting are centerline cracks. Centerline cracks are often accompanied by center segregation and enrichment of non-metallic inclusions. Continuous castings are not easy to weld after they are finished, which seriously affects the product quality of continuous castings. Continuous castings with centerline cracks need to Partial removal, if the cast has more centerline cracks, then the entire cast may be scrapped. The continuous casting process of steel plate is the process of increasing the center line crack. Among them, the continuous casting process of the continuous casting machine segment is t...

Claims

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Application Information

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IPC IPC(8): B22D11/16B22D11/22
CPCB22D11/16B22D11/225
Inventor 彭和平
Owner 攀钢集团西昌钢钒有限公司
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