Method for reducing longitudinal division of weather-proof steel continuously cast slab

A technology of weathering steel and slab, applied in the field of continuous casting, can solve the problem that longitudinal crack defects on the surface of slab and thin slab are not stably controlled, so as to reduce the incidence of longitudinal cracks, stabilize the formation speed, and improve the casting speed. Effect

Inactive Publication Date: 2015-03-11
SHOUGANG CORPORATION
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  • Application Information

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Problems solved by technology

However, for some steels with high crack sensitivity, including low-alloy high-strength steels, peritectic and hypoperitectic steels, and micro-alloyed high-strength steels, the surface longitudinal crack defects of slabs and thin slabs have not been stably controlled.

Method used

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  • Method for reducing longitudinal division of weather-proof steel continuously cast slab
  • Method for reducing longitudinal division of weather-proof steel continuously cast slab
  • Method for reducing longitudinal division of weather-proof steel continuously cast slab

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 300 tons of molten steel ladle, 11 furnaces of continuous casting, see Table 1 for the superheat of molten steel in the casting tundish, the casting speed of the slab, and the temperature of the cooling water at the mold inlet.

[0025] Table 1 Casting molten steel superheat, slab casting speed, crystallizer inlet cooling water temperature

[0026]

[0027] At the same time, the taper of the crystallizer is increased by 0.5mm on the narrow side of the original basis, and the basicity of the mold flux is controlled to 1.40 and the viscosity η 1300℃ The control is 0.70 poise. After the continuous casting, the longitudinal crack occurrence rate of the obtained weathering steel continuous casting slab was 0.57%.

Embodiment 2

[0029] 300 tons of ladle, continuous casting 10 furnaces, casting tundish superheat, slab casting speed, crystallizer inlet cooling water temperature are shown in Table 2.

[0030] Table 2 Casting molten steel superheat, slab casting speed, mold inlet cooling water temperature

[0031]

[0032] At the same time, the taper of the crystallizer is increased by 0.5mm on the narrow side of the original basis, and the basicity of the mold flux is controlled to 1.50 and the viscosity η 1300℃ The control is 0.80 poise. After the continuous casting, the longitudinal crack occurrence rate of the obtained weathering steel continuous casting slab was 0.63%.

Embodiment 3

[0034] 300 tons ladle, continuous casting 12 furnaces, casting tundish superheat, slab casting speed, crystallizer inlet cooling water temperature are shown in Table 3.

[0035] Table 3 Casting molten steel superheat, slab casting speed, mold inlet cooling water temperature

[0036]

[0037] At the same time, the taper of the crystallizer is increased by 0.5mm on the narrow side of the original basis, and the basicity of the mold flux is controlled to 1.45 and the viscosity η 1300℃ The control is 0.75 poise. After the continuous casting, the longitudinal crack occurrence rate of the obtained weathering steel continuous casting slab was 0.52%.

[0038] The invention provides a method for reducing the longitudinal cracks of weathering steel continuous casting slabs. By increasing the casting speed, the production efficiency of crack-sensitive steel types is improved, the mold cooling effect is improved, the number of crystallizer bonding alarms is reduced, and the The incid...

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Abstract

The invention provides a method for reducing longitudinal division of a weather-proof steel continuously cast slab. The control performed in a technological process is that casting is performed at a low molten steel superheat degree and a higher slab pulling rate, wherein the temperature of cooling water at an inlet of a crystallizer is improved in a casting process, and the taper of the crystallizer is increased; the alkalinity of covering slag is improved to be within a range of 1.40-1.50; the viscosity eta of the covering slag is reduced to be within the range of 0.70-0.80 at the temperature of 1,300 DEG C. According to the method for reducing the longitudinal division of the weather-proof steel continuously cast slab, the longitudinal division of the weather-proof steel continuously cast slab can be reduced to be below 0.82 percent from 2.75 percent, and considerable economic benefit can be achieved.

Description

technical field [0001] The invention relates to the technical field of continuous casting, in particular to a method for reducing longitudinal cracking of weathering steel continuous casting slabs. Background technique [0002] Longitudinal cracks are one of the common surface defects of continuous casting slabs. The casting slabs with such defects must be ground off-line, which affects the production rhythm, and serious longitudinal cracks will make the whole slab scrap, even in the continuous casting production process. Longitudinal cracking and steel breakout accidents were caused. Surface longitudinal cracks originate from the inhomogeneous growth of the initial solidified shell near the meniscus of the mold. When the strength is used, the longitudinal cracks begin to appear, and in the subsequent solidification and cooling process, the longitudinal cracks will further expand. [0003] There have been many studies on the causes of longitudinal cracks, which can be summ...

Claims

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Application Information

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IPC IPC(8): B22D11/18
CPCB22D11/18
Inventor 王志鹏吉立鹏赵运堂赵长亮崔阳王莉田贵昌郭小龙
Owner SHOUGANG CORPORATION
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