Wide slab longitudinal crack control process

A longitudinal crack and slab technology, which is applied in the field of longitudinal crack control of wide slabs, can solve the problems of longitudinal cracks, width and thickness of wide slabs, and achieve the effect of reducing the possibility of cracks.

Inactive Publication Date: 2020-10-13
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the width-to-thickness ratio of the wide slab is higher, so it is more likely to cause longitudinal cracks during production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: A wide slab longitudinal crack control process provided in this embodiment includes:

[0018] In the continuous casting process, steel grades with a manganese-sulfur ratio of 30 are used when the carbon mass fraction is in the range of 0.10% to 0.16%;

[0019] Use mold flux with an alkalinity within the range of 1.19, and set the melting point of the mold flux to be 30°C lower than the melting point of conventional slabs and thick slabs;

[0020] Control the cooling intensity of the wide side of the crystallizer to 5100L / min, and the narrow side to 250L / min, set the water inlet temperature of the crystallizer to 31°C, and set the water flow rate in the crystallizer to 6m / s;

[0021] The overall taper of the crystallizer was set at 1.05% / m.

Embodiment 2

[0022] Embodiment 2: A wide slab longitudinal crack control process provided in this embodiment includes:

[0023] In the continuous casting process, steel grades with a manganese-sulfur ratio of 33 are used when the carbon mass fraction is in the range of 0.10% to 0.16%;

[0024] Use mold flux with an alkalinity within the range of 1.26, and set the melting point of the mold flux to be 40°C lower than that of conventional slabs and thick slabs;

[0025] Control the cooling intensity of the wide surface of the crystallizer to 5200L / min, and the narrow surface to 300 L / min, set the water inlet temperature of the crystallizer to 35°C, and set the water flow rate in the crystallizer to 7m / s;

[0026] The overall taper of the crystallizer was set at 1.10% / m.

Embodiment 3

[0027] Embodiment 3: A wide slab longitudinal crack control process provided in this embodiment includes:

[0028] In the continuous casting process, steel grades with a manganese-sulfur ratio of 35 are used when the carbon mass fraction is in the range of 0.10% to 0.16%;

[0029] Use mold flux with an alkalinity within the range of 1.31, and set the melting point of the mold flux to be 50°C lower than the melting point of conventional slabs and thick slabs;

[0030] Control the cooling intensity of the wide side of the crystallizer to 5300L / min, and the narrow side to 350 L / min, set the water inlet temperature of the crystallizer to 39°C, and set the water flow rate in the crystallizer to 8m / s;

[0031] The overall taper of the crystallizer was set at 1.10% / m.

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PUM

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Abstract

The invention discloses a wide slab longitudinal crack control process, and relates to the technical field of continuous casting processes. The manganese-sulfur ratio is improved by reducing the massfraction of sulfur, manganese and the sulfur are combined to generate manganese sulfide, and the manganese sulfide is a plastic inclusion so that the sensitivity of cracks can be effectively reduced;high-alkalinity casting powder has lower heat-conducting property and higher crystallization rate so that the defect of surface cracks a cast slab caused by peritectic reaction can be effectively overcome; the cooling intensity of a crystallizer is properly reduced so that the cooling non-uniformity can be effectively relieved, and then a uniform slab shell is obtained; and the overall taper of the crystallizer is set in a proper interval, so that serious abrasion of a slab shell and a copper plate caused by the too large overall taper is avoided, the situation that the two side faces of the cast slab are bulged due to the fact that an initial slab shell cannot be effectively supported due to the fact that a gap between the initial slab shell and the copper plate becomes large due to the too small overall taper is also avoided, and through the arrangement, the occurrence rate of longitudinal cracks can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of continuous casting technology, in particular to a technology for controlling longitudinal cracks of wide slabs. Background technique [0002] Longitudinal cracks in continuous casting slabs are the main defects that affect the output of casting machines and slabs. Serious cases will lead to breakout or scrapping of slabs, which will affect the operation rate of casting machines and metal yield. The production plan was messed up. [0003] The No. 1 wide slab continuous caster of Nanjing Iron and Steel No. 1 Steelmaking Plant adopts voestalpine technology. Since it was put into production, longitudinal cracks on the surface have been a difficult problem to solve. The wide slab produced by this casting machine has a large section, with a width of 3250mm and a thickness of 150mm. It is one of the widest continuous casting machines in production in the world at present, and its aspect ratio is as high as 21.7...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/22B22D11/111
CPCB22D11/111B22D11/16B22D11/165B22D11/22
Inventor 常运合聂真来
Owner NANJING IRON & STEEL CO LTD
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