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Nitrogen content control method for FB2 steel smelted by vacuum induction furnace

A technology of vacuum induction furnace and control method, applied in the direction of furnace, electric furnace, furnace type, etc., can solve the problem of inaccurate control of nitrogen content, achieve the effect of reducing hydrogen content, increasing solubility and surface adsorption, and increasing nitrogen content

Inactive Publication Date: 2015-03-18
SHANGHAI HEAVY MACHINERY PLANT
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Problems solved by technology

The control of nitrogen content by these two methods is not precise

Method used

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  • Nitrogen content control method for FB2 steel smelted by vacuum induction furnace
  • Nitrogen content control method for FB2 steel smelted by vacuum induction furnace

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Embodiment Construction

[0024] Such as figure 1 As shown, the nitrogen content control method of the vacuum induction furnace smelting FB2 steel of the present invention controls the nitrogen content in the steel by increasing the nitrogen partial pressure, comprising the following steps:

[0025] The first step, loading;

[0026] Load the solid alloy steel raw material into the vacuum induction furnace;

[0027] The second step is to vacuum;

[0028] Vacuumize the vacuum induction furnace to make the vacuum degree of the furnace chamber below 233Pa;

[0029] After the vacuum degree of the furnace chamber reaches below 233Pa, maintain the vacuum degree in the furnace for 10-12 minutes, and then proceed to the next step;

[0030] The third step is to fill with nitrogen;

[0031] Fill nitrogen into the vacuum induction furnace with a vacuum degree below 233Pa, so that the nitrogen pressure in the vacuum induction furnace is not less than 30KPa;

[0032] The fourth step, melting;

[0033] The vacu...

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Abstract

The invention discloses a nitrogen content control method for FB2 steel smelted by a vacuum induction furnace. The nitrogen content in steel is controlled by improving the nitrogen partial pressure, and the method comprises the following steps: step 1, charging; step 2, vacuumizing; step 3, filling with nitrogen; step 4, melting down; step 5, performing vacuum casting; and step 6, destroying the vacuum environment and adding a protective slag. The vacuum induction furnace is employed for smelting FB2 steel, the partial pressure of nitrogen in the vacuum induction furnace is improved by filling with nitrogen, the saturation solubility and the surface adsorption rate of steel in molten steel are improved, and the nitrogen content in molten steel is increased, and thus the target of controlling the nitrogen content is realized.

Description

technical field [0001] The invention relates to a method for controlling the nitrogen content of steel, in particular to a method for controlling the nitrogen content of FB2 steel smelted in a vacuum induction furnace. Background technique [0002] Nitrogen content needs to be controlled during iron and steel smelting. The existing control method is to control the nitrogen content by nitriding the alloy or blowing nitrogen into the molten steel from the furnace bottom. These two methods provide imprecise control of nitrogen content. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a nitrogen content control method for smelting FB2 steel in a vacuum induction furnace, which can achieve the goal of controlling the nitrogen content. [0004] For solving the above-mentioned technical problems, the technical solution of the nitrogen content control method of vacuum induction furnace smelting FB2 steel of the present ...

Claims

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Application Information

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IPC IPC(8): C21C5/52
Inventor 李滋楠管仲毅魏雪晴张窑何志斌
Owner SHANGHAI HEAVY MACHINERY PLANT
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