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Controlling method of center segregation of continuous casting

A control method and continuous casting slab technology, which is applied in the field of steelmaking and continuous casting, can solve problems such as poor control of continuous casting slab center segregation, and achieve the effects of improving product performance, improving segregation control level, and improving homogenization performance

Active Publication Date: 2018-11-23
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for controlling and evaluating the central segregation of continuous casting slabs, which solves the technical problem of poor control of continuous casting slab central segregation in the prior art

Method used

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  • Controlling method of center segregation of continuous casting
  • Controlling method of center segregation of continuous casting
  • Controlling method of center segregation of continuous casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The production process of a steel slab continuous casting, the range of steel smelting alloy elements includes (mass percentage): C0.09%, Mn 1.85%, Ti 0.1%, the average superheat of the tundish steel level is 30°C, and the cross-sectional specifications of the cast slab It is 1600×230mm, the pulling speed is set to 1.1m / min, and the constant pulling speed remains unchanged. After the secondary cooling water volume is 120%, the specific water volume increases from 0.8L / kg to 1.0L / kg. Considering the impact of increasing the amount of secondary cooling water on the end point of solidification, the starting position of the interval is set in real time according to the tracking calculation of the continuous casting slab solidification heat transfer model. Before increasing the water amount, the reduction interval is the 7th-9th segment; increase After water volume, the depression interval is the 6th-8th sector. The total amount of reduction is evenly distributed by the thr...

Embodiment 2

[0051] As a comparative setting, the segregation control scheme is set for the same elemental control measures using conventional control ideas.

[0052]In the production process of a steel slab continuous casting, the steel smelting composition alloy element range includes (mass percentage): C0.09%, Mn 1.85%, Ti 0.1%, the average superheat of the tundish steel level is 21°C, and the cross-sectional specification of the cast slab It is 1600×230mm, the pulling speed is set to 1.1m / min, and the constant pulling speed remains unchanged. The secondary cooling water volume is 100%, and the specific water volume is 0.8L / kg. Considering the impact of increasing the amount of secondary cooling water on the end point of solidification, the starting position of the interval is set in real time according to the tracking calculation of the continuous casting slab solidification heat transfer model. Before increasing the water amount, the reduction interval is the 7th-9th segment; increase...

Embodiment 3

[0055] As a comparative setting, the segregation control scheme is set for the same elemental control measures using conventional control ideas.

[0056] In the production process of a certain steel slab continuous casting, the steel smelting composition alloy elements range includes (mass percentage): C0.10%, Mn 1.95%, Ti 0.15%, the average superheat of the tundish steel level is 32°C, and the cross-sectional specification of the cast slab It is 1600×230mm, the pulling speed is set to 1.2m / min, and the constant pulling speed remains unchanged. The secondary cooling water volume is 100%, and the specific water volume is 0.8L / kg. Considering the impact of increasing the amount of secondary cooling water on the end point of solidification, the starting position of the interval is set in real time according to the tracking calculation of the continuous casting slab solidification heat transfer model. Before increasing the water amount, the reduction interval is the 7th-9th segmen...

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Abstract

The invention belongs to the technical field of steel-making continuous casting, and discloses a controlling method of center segregation of a continuous casting. The method comprises the steps of high superheat controlling: the superheat of molten steel in a pouring box is controlled at 30 DEG C or above; strong secondary cooling controlling: in secondary cooling, secondary cold water amount is increased by 20-50%; downward screwing controlling: at the solidifying final stage of the production process of the continuous casting, the downward screwing depth is controlled at 4.2-7.2 mm; the components of the molten liquid is controlled at, by mass, 0.09-0.12% C, 1.85-2.20% Mn and 0.1-0.2% Ti. The controlling method of the center segregation of the continuous casting is used for high-strengthsteel and pipe line steel, through specific component element controlling and superheat, downward screwing amount and secondary cooling strength controlling, the segregation is compressed at a central line region, and component homogenizing performance is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking and continuous casting, in particular to a control method for central segregation of continuous casting slabs. Background technique [0002] With the expansion of the market and the development of varieties, the requirements for the internal quality control of continuous casting slabs are becoming increasingly strict, especially new requirements are put forward for the homogenization level of components of continuous casting slabs. Therefore, the central segregation of the continuous casting slab must be strictly controlled during the trial production of new varieties and the production of high-grade varieties of steel. [0003] The macroscopic flow of molten steel causes high solute molten steel to gather in the center of the slab, which worsens the center segregation. The research shows that the solidification structure of the slab has an important influence on the central segregation. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/18B22D11/22C22C38/04C22C38/14
CPCB22D11/16B22D11/182B22D11/225C22C38/04C22C38/14
Inventor 曾智李向奎季晨曦杨晓山田志红周绍轩罗衍昭宋佳友唐德池李峰
Owner SHOUGANG CORPORATION
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