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Continuous casting method for steel billets

A continuous casting and billet technology, applied in the field of billet continuous casting, can solve the problems of unpredictable joint breakout, excessive shrinkage of billet shell, poor welding, etc., and achieve the effect of eliminating poor welding.

Inactive Publication Date: 2013-06-26
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is mainly used for the alarm of continuous casting breakout, and it is impossible to predict the breakout of joint marks
[0004] In addition, through long-term production practice, it is found that in the above-mentioned billet continuous casting process, cold steel is prone to appear on the surface of the molten steel in the crystallizer, and the billet shell shrinks too much, which leads to the replacement of the old and new molten steel when the tundish is replaced. Poor welding at the traces may easily cause steel leakage accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Molten steel with the composition described in Table 1 (the degree of superheat is 20° C.) was injected into the crystallizer for continuous casting, and at the same time, mold powder was added to the mold, and the mold powder contained 35.5% by weight of CaO, 34.5 wt% SiO 2 , 6.5 wt% Al 2 o 3 , 6.7 wt% Na 2 O, 4.8% by weight of C, the rest being Fe 2 o 3 and MnO, relative to each ton of the molten steel, the addition of the mold flux is 0.5 kg. The continuous casting conditions include: the casting speed is 1 m / min, and the cross-sectional size of the slab is 200mm×1160mm. Wherein, during the process of changing the bag and stopping the injection of molten steel into the crystallizer, the casting speed of the continuous casting is first reduced to zero, and after an interval of 2 seconds, the pulling speed is restarted at 0.3m / min, and the cycle is like this 3 times to pull the continuous casting slab to the bag changing position, remove the large slag produced a...

Embodiment 2

[0047] Molten steel with the composition described in Table 1 (the degree of superheat is 20° C.) was injected into the crystallizer for continuous casting, and at the same time, mold powder was added to the mold, and the mold powder contained 35.5% by weight of CaO, 34.5 wt% SiO 2 , 6.5 wt% Al 2 o 3 , 6.7 wt% Na 2 O, 4.8% by weight of C, the rest being Fe 2 o 3 and MnO, relative to each ton of the molten steel, the addition of the mold flux is 0.5 kg. The continuous casting conditions include: the casting speed is 1.2 m / min, and the section size of the slab is 200mm×1160mm. Wherein, during the process of changing the bag and stopping the injection of molten steel in the mold, the casting speed of the continuous casting is first reduced to zero, and after an interval of 3 seconds, the pulling speed is restarted at a pulling speed of 0.3m / min, and the cycle is like this 2 times, to pull the continuous casting slab to the bag changing position, and remove the large slag pr...

Embodiment 3

[0050] Molten steel (the superheat degree is 25 ℃) of the composition described in Table 1 was injected into the crystallizer for continuous casting, and at the same time, mold powder was added to the mold, and the mold powder contained 35.5% by weight of CaO, 34.5 wt% SiO 2 , 6.5 wt% Al 2 o 3 , 6.7 wt% Na 2 O, 4.8% by weight of C, the rest being Fe 2 o 3 and MnO, relative to each ton of the molten steel, the addition of the mold slag is 0.6 kg. The continuous casting conditions include: the casting speed is 1.4 m / min, and the section size of the slab is 200mm×1160mm. Wherein, during the process of changing the bag and stopping the injection of molten steel into the crystallizer, the casting speed of the continuous casting is first reduced to zero, and after an interval of 2 seconds, the pulling speed is restarted at a pulling speed of 0.4m / min, and the cycle is like this 2 times, to pull the continuous casting slab to the bag changing position, and remove the large slag...

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PUM

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Abstract

The invention relates to a continuous casting method for steel billets. The continuous casting method for the steel billets comprises the following steps. Crystallizer casting powder is added to a crystallizer, molten steel in a plurality of tundishes is injected into the crystallizer in sequence, and a continuous casting billet is pulled and rectified, wherein the molten steel in the tundishes is injected into the crystallizer under the condition that the pulling speed of the continuous casting fillet is larger than 0.8m / min. In the process of tundish changing and stopping injecting the molten steel into the crystallizer, the pulling speed of continuous casting is lowered to zero. After 2-5 seconds passes, pulling and rectifying are restarted with the pulling speed of 0.3-0.4m / min, and circulation is performed 2-4 times in such a way. Thus, the continuous casting billet is pulled to a tundish changing position, the crystallizer is taken out from large slag crust produced at the tundish changing position, and small slag crust is mashed so as to be converged in the middle of the crystallizer. The molten steel is continuously injected into the crystallizer after the tundishes are changed, and a steel liquid face of the crystallizer is stirred. With the adoption of the continuous casting method for the steel billets, new and old steel molten can be well welded at a weld line when the tundishes are changed, and steel leakage accidents due to poor welding of the new steel molten and the old steel molten when the tundishes are changed are completely eradicated.

Description

technical field [0001] The invention relates to a method for continuous casting of steel slabs. Background technique [0002] In the process of continuous casting, molten steel flows into the tundish through the ladle, and then flows into the crystallizer from the tundish for rapid cooling to form a slab with a liquid core. After secondary cooling in the fan section, it is stretched and straightened to form a slab. The refractory material of the tundish is eroded and eroded by molten steel, and has a limited service life. To achieve continuous production, the tundish must be hot-replaced online. When replacing the tundish, there will be welding of the old and new shells. If the operation is improper during the replacement process , will form a steel breakout accident. Breakout is a vicious and destructive accident in the continuous casting production process, which not only affects the continuous casting machine's operating rate and reduces the molten steel yield, but also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18
Inventor 彭和平谯文姚玉磊
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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