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Continuous casting method for steel billets

A continuous casting and steel slab technology, applied in the field of continuous casting of steel slabs, can solve problems such as cold steel, poor welding of new and old molten steel, and steel breakout accidents, so as to achieve the effect of eliminating steel breakout accidents

Inactive Publication Date: 2012-11-21
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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, which will lead to poor welding of the old and new molten steel at the seam when the tundish is replaced, which will easily cause leakage. steel accident

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The following examples are used to illustrate the method for continuous casting of steel slabs provided by the present invention.

[0024] The molten steel of the composition described in Table 1 is injected into the crystallizer for continuous casting, and mold powder is added to the mold at the same time, and the mold powder contains 35.5% by weight of CaO and 34.5% by weight of 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 3and MnO, with respect to each ton of the molten steel, the addition of mold slag in the mold is 0.5 kilograms, so that the mold slag in the mold has a thickness of 15 mm from top to bottom. 10mm layer of sintered slag and 10mm thick layer of liquid slag. The continuous casting conditions include: the casting speed is 1 m / min, and the cross-sectional size of the slab is 200mm×1160mm. 8 minutes before the injection of molten steel into the crystallizer at the end of the tundish, by reducing the addition ...

Embodiment 2

[0027] The following examples are used to illustrate the method for continuous casting of steel slabs provided by the present invention.

[0028] The molten steel of the composition described in Table 1 is injected into the crystallizer for continuous casting, and mold powder is added to the mold at the same time, and the mold powder contains 35.5% by weight of CaO and 34.5% by weight of 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, with respect to each ton of the molten steel, the addition of the mold slag in the mold is 0.55 kilograms, so that the mold slag in the mold has a thickness of 18 mm from top to bottom. 12mm sintered slag layer and 13mm liquid slag layer. The continuous casting conditions include: the casting speed is 1 m / min, and the cross-sectional size of the slab is 200mm×1160mm. 5 minutes before the injection of molten steel into the crystallizer at the end of the tundish, by reducing the amount of mold ...

Embodiment 3

[0031] The following examples are used to illustrate the method for continuous casting of steel slabs provided by the present invention.

[0032] The molten steel of the composition described in Table 1 is injected into the crystallizer for continuous casting, and mold powder is added to the mold at the same time, and the mold powder contains 35.5% by weight of CaO and 34.5% by weight of 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, with respect to each ton of the molten steel, the addition of the mold slag in the mold is 0.6 kilograms, so that the mold slag in the mold has a thickness of 20 mm from top to bottom. 15mm layer of sintered slag and 16mm thick layer of liquid slag. The continuous casting conditions include: the casting speed is 1 m / min, and the cross-sectional size of the slab is 200mm×1160mm. 7 minutes before the injection of molten steel into the crystallizer at the end of the tundish, by reducing the amou...

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Abstract

The invention relates to a continuous casting method for steel billets, which comprises the following steps of: injecting molten steel in a plurality of tundishes into a crystallizer in turn, performing continuous casting, and adding crystallizer slag powder into the crystallizer, wherein for each tundish, the addition amount of the crystallizer slag powder ensures that three layers of crystallizer slag powder, namely a raw slag layer, a sintering slag layer and a liquid slag layer, are formed in the crystallizer in turn from top to bottom in a first time period; and the addition amount of the crystallizer slag powder ensures that the sintering slag layer and the liquid slag layer are formed in the crystallizer in turn from top to bottom, or only the liquid slag layer is formed in a second time period, and the thickness of the sintering slag layer is less than 5mm. The continuous casting method for the steel billets can ensure that cold steel is not crystallized on the surface of the molten steel in the crystallizer, and new molten steel and old molten steel are well welded on a weld line when the tundishes are changed, and effectively avoids steel leakage accidents.

Description

technical field [0001] The invention relates to a method for continuous casting of steel slabs. Background technique [0002] Billet continuous casting is to use a tundish with a certain capacity to store molten steel to realize continuous casting of molten steel, that is, the molten steel in the molten steel tank reaches the tundish through the long nozzle, and the molten steel in the tundish reaches the crystallizer through the submerged nozzle. The molten steel is cooled by the cooling water around the crystallizer to form a solidified slab shell with a certain strength, which is continuously pulled out under the traction of the power system of the casting machine. [0003] The working layer of the tundish is knotted with refractory materials. It is in contact with molten steel during the casting process and is gradually eroded. After the erosion reaches a certain level, the safety of the casting process cannot be guaranteed. Therefore, the tundish must be replaced. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/04B22D11/111
Inventor 周明佳
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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