Process for controlling melting speed of large slab electric slag furnace

An electroslag furnace and melting speed technology, applied in the field of metallurgy, can solve problems such as segregation, porosity increase, and metal molten pool deepening, etc., to achieve the effects of reducing production costs, reducing losses, and avoiding flaw detection failures

Inactive Publication Date: 2018-01-19
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the melting rate is high, the molten metal pool deepens, and the risk of internal defects such as segregation and porosity increases

Method used

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  • Process for controlling melting speed of large slab electric slag furnace
  • Process for controlling melting speed of large slab electric slag furnace
  • Process for controlling melting speed of large slab electric slag furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] For a 50t-level slab electroslag furnace in a steel company, the process includes melting rate process design, offline simulation calculation, and process intervention control. The specific methods are as follows:

[0019] 1) The melting rate process design adopts the three-stage formula of "initial melting rate-maintaining melting rate-feeding melting rate".

[0020] The "initial melting rate" is 16kg / min. In the stage of "initial melting rate-maintaining melting rate", the melting rate increases gradually. The increase of melting rate is controlled by 0.5kg / min. The consumable electrode melts 1 / 5 of the total weight When (that is, 10 tons) to maintain the melting rate, the "maintaining melting rate" is 20kg / min.

[0021] In the stage of "maintaining the melting speed-feeding and shrinking the melting speed", the melting speed will decrease gradually. When the remaining weight of the consumable electrode is 1 / 4 of the total weight, it will start to decrease, and the de...

Embodiment 2

[0028] For a 45t-level slab electroslag furnace in a steel company, the process includes melting rate process design, offline simulation calculation, and process intervention control. The specific methods are as follows:

[0029] 1) The melting rate process design adopts the three-stage formula of "initial melting rate-maintaining melting rate-feeding melting rate".

[0030] The "initial melting rate" is 16kg / min. In the stage of "initial melting rate-maintaining melting rate", the melting rate increases gradually. The increase of melting rate is controlled by 0.5kg / min. The consumable electrode melts 1 / 5 of the total weight When it reaches the maintenance melting rate (ie 9 tons), the "maintenance melting rate" is 20kg / min.

[0031] In the stage of "maintaining the melting speed-feeding and shrinking the melting speed", the melting speed will decrease gradually. When the remaining weight of the consumable electrode is 1 / 3 of the total weight, it will start to decrease, and th...

Embodiment 3

[0038] For a 35t-level slab electroslag furnace in a steel company, the process includes melting rate process design, offline simulation calculation, and process intervention control. The specific methods are as follows:

[0039] 1) The melting rate process design adopts the three-stage formula of "initial melting rate-maintaining melting rate-feeding melting rate".

[0040] The "initial melting rate" is 15kg / min. In the stage of "initial melting rate-maintaining melting rate", the melting rate increases gradually. The increase of melting rate is controlled by 0.5kg / min. The consumable electrode melts 1 / 5 of the total weight When (that is, 7 tons) to maintain the melting rate, the "maintaining melting rate" is 19kg / min.

[0041] In the stage of "maintaining melting speed-feeding and shrinking melting speed", the melting speed decreases, and the remaining weight of the consumable electrode is 1 / 4 of the total weight, and the decline of melting speed is controlled by 0.5kg / min. ...

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Abstract

The invention discloses a process for controlling the melting speed of a large slab electric slag furnace. The process includes the steps of melting speed process design, offline stimulation computation, and procedure intervention and regulation. Procedure intervention and regulation is realized through voltage and current regulation. The three stages of the starting melting speed, the keeping melting speed and the feeding melting speed are adopted for melting speed process design, and the starting melting speed is 14-16 kg/min. According to the process, process design of the melting speed iscarried out, and the three stages of the starting melting speed, the keeping melting speed and the feeding melting speed are adopted; an Excel table tool is used for carrying out offline simulation onthe designed melting speeds; and in the production procedure, voltage and current can be manually regulated according to the conditions of the practical melting speed, so that the effect that the deviation of the practical melting speed and the set melting speed is within the range of +/-1 kg/min is guaranteed, and process execution precision is greatly improved. Production and quality accidentscaused by unreasonable melting speeds are completely eradicated, loss is reduced, production cost is lowered, and benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a process for controlling the melting speed of a large slab electroslag furnace. Background technique [0002] Extra-thick steel plates are key materials for high-end equipment manufacturing. With the development of the national economy, equipment tends to be large-scale and high-end, and the demand for large single-weight extra-thick steel plates at home and abroad is increasing. However, extra-thick steel plates have strict requirements on product quality and performance. Steel plates rolled from ordinary steel ingots cannot meet the requirements because of defects such as center segregation, porosity, and inclusions inside, especially those that have requirements for thickness direction performance and ultrasonic flaw detection. High-end extra-thick steel plates still need to be imported. [0003] Electroslag remelting is a special refining process. Compared wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
Inventor 郭宏磊毕殿阁宋瑞甫薛帅斌刘强
Owner WUYANG IRON & STEEL
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