Method of improving yield of continuous casting molten steel

A yield and molten steel technology, applied in casting equipment, casting melt containers, mechanical cleaning, etc., can solve problems such as increasing the difficulty of operation, and achieve the effect of improving the yield of molten steel and facilitating slag discharge.

Active Publication Date: 2018-03-02
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that it has wide applicability, saves molten steel and lime, and the premise of applying this method is that the heat recovery of steel and slag should be carried out under the condition that the production rhythm allows, and the repeated operation of the crane, the addition of casting slag, etc. Adding white ash after slag and other calculations that break the conventional experience will increase the difficulty of operation

Method used

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  • Method of improving yield of continuous casting molten steel
  • Method of improving yield of continuous casting molten steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment takes Q235B steel as an example, and its main chemical composition range is: C: 0.15% to 0.19%, Si: 0.07% to 0.17, Mn: 0.20% to 0.35%, P<0.025%, S<0.025%, The rest is Fe and unavoidable impurities.

[0029] Continuously cast 14 bags of molten steel with large ladles according to the method of the present invention. When casting the 7th bag and the 13th bag, the liquid level of the tundish is raised twice for slagging, and the 13th bag of molten steel is cast before slagging. The billets were sampled, the inspection results are shown in Table 1, and the effect verification is shown in Table 2;

[0030] The chemical composition (%) of cast steel of table 1 embodiment 1

[0031] C

Embodiment 2

[0032] Table 2 embodiment 2 effect verification

[0033]

[0034] [Example 2]

[0035] A method for improving the yield rate of continuous casting molten steel, the specific steps are as follows:

[0036] This embodiment takes Q235B steel as an example, and its main chemical composition range is: C: 0.15% to 0.19%, Si: 0.07% to 0.17, Mn: 0.20% to 0.35%, P<0.025%, S<0.025%, The rest is Fe and unavoidable impurities.

[0037] Continuously cast 14 bags of molten steel with large ladles according to the method of the present invention, when casting the 5th bag, the 9th bag, and the 13th bag, raise the liquid level of the tundish for three times and carry out slagging, and cast the 9th bag of molten steel Sampling of the slab before slag discharge, the inspection results are shown in Table 3, and the effect verification is shown in Table 4;

[0038] The chemical composition (%) of cast steel of table 3 embodiment 2

[0039] C

Si

mn

P

S

0.17

0....

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Abstract

The invention relates to a method for improving a yield of continuous casting molten steel. The method comprises steps of (1) forwardly moving an tundish retaining wall, (2) spraying a repairing material to a slag line position of the tundish retaining wall, (3) constructing a slag overflow groove in a tail part of the tundish, (4) adjusting molten steel flow via a sliding plate during casting, closing the sliding plate when slag is discharged and then re-opened after five to eight seconds, and repeating the work until the molten steel of a large pack is fully cast into the tundish, (5) increasing a flow of the large pack casting molten steel via adjustments of the sliding plate, arising a molten steel liquid level of the tundish, timely discharging steel slag via the slag overflow groove,decreasing the molten steel flow after the slag discharging work is finished, so the molten steel liquid level of the tundish can restore to a normal height, and (6) repeating the step (4) and step (5) until the whole casting process is completed. The tundish structure is improved, the sliding plate is controlled during a large pack casting process and the slag of the tundish is timely discharged, so the molten steel yield can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of continuous casting, in particular to a method for increasing the yield of molten steel in continuous casting. Background technique [0002] The yield of molten steel is an important index for evaluating the continuous casting process. A high yield of molten steel can not only avoid the waste of heat, alloy and labor costs in the entire smelting process, but also increase the output of billets to a large extent, and ultimately make the The production cost per unit billet is reduced. Taking the 120t steel ladle as an example, if slag discharge is to be avoided, the operator must transfer the ladle in advance. And this more than 2 tons of steel and slag mixture will be dumped into the slag tank for processing. If a part of the molten steel is to be drained, operations such as slag detection or manual slag listening must be supplemented, but these operations cannot 100% avoid slag discharge. How to cast as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18B22D41/00B22D43/00
Inventor 沈明钢闫心怡王爽朱晓雷韩楚菲刘拓肖志禹纪坤锋冯超王兴
Owner UNIV OF SCI & TECH LIAONING
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