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Plasma submerged arc heating method of 5 to 600-ton steel ingot riser

A submerged arc heating and plasma technology, which is applied in the field of plasma submerged arc heating of steel ingot risers of 5 tons to 600 tons, can solve the problems of small influence of surrounding measuring instruments, low power utilization rate, low noise, etc. Improve, improve the yield rate, and promote the effect of floating

Active Publication Date: 2014-06-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a plasma submerged arc heating method for steel ingot risers of 5 tons to 600 tons, which overcomes the shortcomings of traditional plasma flame heating such as high noise and low utilization rate of electric energy, and has the advantages of low energy consumption, low noise, and high efficiency. The arc is fast, and the influence on the surrounding measuring instruments is small, which is suitable for the riser heating of the steel ingot.

Method used

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  • Plasma submerged arc heating method of 5 to 600-ton steel ingot riser
  • Plasma submerged arc heating method of 5 to 600-ton steel ingot riser
  • Plasma submerged arc heating method of 5 to 600-ton steel ingot riser

Examples

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Effect test

Embodiment 1

[0064] Trial production of 5.3 tons of steel ingots, pouring molten steel material 42CrMo, pouring molten steel weight 5.3 tons, filling time 17.5min, pouring temperature 1530 ℃.

[0065] Such as Figure 8 As shown, in this embodiment, the plasma submerged arc heating method for the steel ingot riser of 5 tons to 600 tons is as follows:

[0066] 1) Strictly control the smelting process, start with the ingredients, select high-quality scrap steel, and reduce the impurity content, P≤0.01wt%, S≤0.01wt%.

[0067] 2) Before the ingot mold is closed, the riser is not preheated.

[0068] 3) During the pouring process, the slow pouring method is adopted, and mold slag is hung at a distance of 300mm from the bottom of the steel ingot.

[0069] 4) 15.5 minutes after the steel ingot is poured, the plasma submerged arc heating gun starts arcing with 5L / min argon gas, and the voltage is 50V; after 2 minutes, the steel ingot is poured and the plasma submerged arc heating gun is preheated....

Embodiment 2

[0072] Trial production of 5.5 tons of steel ingots, pouring molten steel material 42CrMo, pouring molten steel weight 5.8 tons, filling time 18min, pouring temperature 1540 ℃.

[0073] Such as Figure 8 As shown, in this embodiment, the plasma submerged arc heating method for the steel ingot riser of 5 tons to 600 tons is as follows:

[0074] 1) Strictly control the smelting process, start with the ingredients, select high-quality scrap steel, and reduce the impurity content, P≤0.01, S≤0.01.

[0075] 2) Before the ingot mold is closed, the riser is preheated, and the preheating temperature is ≥450°C.

[0076] 3) During the pouring process, the slow pouring method is adopted, the ingot body is poured for 10 minutes, and the riser is poured for 8 minutes.

[0077] 4) 16 minutes after the steel ingot is poured, the plasma submerged arc heating gun starts arcing with 6L / min argon gas, and the voltage is 80V; after 2 minutes, the steel ingot is poured and the plasma submerged ar...

Embodiment 3

[0080] Trial production of 5.5 tons of steel ingots, pouring molten steel material 42CrMo, pouring molten steel weight 5.5 tons, filling time 18min, pouring temperature 1560 ℃.

[0081] Such as Figure 8 As shown, in this embodiment, the plasma submerged arc heating method for the steel ingot riser of 5 tons to 600 tons is as follows:

[0082] 1) Strictly control the smelting process, start with the ingredients, select high-quality scrap steel, and reduce the impurity content, P≤0.02, S≤0.01.

[0083] 2) Before the ingot mold is closed, the riser is not preheated.

[0084] 3) During the pouring process, the slow pouring method is adopted, the ingot body is poured for 10 minutes, and the riser is poured for 8 minutes.

[0085] 4) 16 minutes after the steel ingot is poured, the plasma submerged arc heating gun starts arcing with 7L / min argon gas, and the voltage is 120V; after 2 minutes, the steel ingot is poured and the plasma submerged arc heating gun is preheated. When the ...

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Abstract

The invention relates to the preparation field of steel ingots, and particularly relates to a plasma submerged arc heating method of 5 to 600-ton steel ingot riser. The method comprises the step of heating a riser after pouring a large-scale steel ingot so as to increase the heat of the riser, strengthen the feeding of the riser and improve the quality of the steel ingot; the method is suitable for plasma submerged arc heating of the riser after the steel ingot is poured, tundish plasma submerged arc heating of other alloys and submerged arc plasma heating in a smelting process. The riser of the large-scale steel ingot is heated by a plasma submerged arc heating gun; the pouring temperature and the pouring speed of the steel ingot, the plasma submerged arc heating time and the argon introducing amount are strictly controlled; the negative segregation of the steel ingot is controlled by heating the steel ingot immediately after the steel ingot is poured; the feeding of the riser is strengthened by heating the riser and rapidly building a positive temperature gradient; the loosen defect of the steel ingot contraction cavities are reduced and the defect is controlled at a first level; foreign matters can float up rapidly by the stirring function of the argon; and the total amount of foreign matters in the steel ingots is controlled to be less than or equal to a second level.

Description

technical field [0001] The invention relates to the field of steel ingot preparation, in particular to a plasma submerged arc heating method for steel ingot risers of 5 tons to 600 tons, which is a plasma submerged arc heating process for steel ingot risers. It is suitable for the plasma submerged arc heating of the riser after the steel ingot is poured, the plasma submerged arc heating of the tundish of other alloys and the submerged arc plasma heating of the smelting process. Background technique [0002] Steel ingot is the base material of forgings, and all forgings are derived from steel ingots, especially the quality of large steel ingots will directly affect the quality of large forgings. With the improvement of our country's basic construction level, higher and higher requirements are put forward for the manufacturing level of large forgings. In the past, the flaw detection of thermal power unit rotors was 1.6mm flat-bottomed hole equivalent, and now the technical req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D7/10
Inventor 夏立军李殿中王雪东康秀红傅排先刘宏伟李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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