A kind of slag system for electroslag remelting

An electroslag remelting and slag-based technology, applied in the field of electroslag metallurgy, can solve problems such as incomplete ignition and dehydration, difficult removal, and hydrogenation of slag

Active Publication Date: 2018-01-02
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the slag system commonly used in production includes lime CaO and alumina powder Al 2 o 3 , lime is very easy to absorb moisture and pulverize, and the OH generated after baking 一 Difficult to remove, or quickly absorb moisture again in contact with the atmosphere during the process of entering the furnace after removal; even if only 1% lime is hydrated, it will increase the hydrogenation of slag by 70 ppm
Alumina powder is extracted from natural bauxite, after chemical treatment to produce Al(OH) 3 , and then dehydrated by burning to obtain Al 2 o 3 , the burning dehydration is not complete, the traditional baking system can decompose the remaining Al(OH) 3 powerless

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The composition and mass percentage of the slag system used for electroslag remelting in this embodiment are designed as: CaF 2 : 50~60%, CaO: 5~20%, SiO 2 : 20~35%, Al 2 o 3 : 5~15%, the rest are unavoidable impurities.

[0012] The consumable electrode is produced by the conventional production process. Specifically, the steel is smelted by electric arc furnace smelting and refining furnace refining and vacuum degassing, and the electrode is molded into an electrode, and then the electrode rod is annealed. Samples were taken on the consumable electrode, and the H content was detected to be 1.2ppm with special gas detection equipment.

[0013] According to the final test, the composition and mass percentage of the slag used for electroslag remelting are: CaF 2 : 55.80%, CaO: 10.21%, SiO 2 : 25.58%, Al 2 o 3 : 8.09%, and the rest are unavoidable impurities.

[0014] The consumable electrode was electroslag remelted according to the conventional process. After re...

Embodiment 2

[0016] The composition and mass percentage of the slag system used for electroslag remelting in this embodiment are designed as: CaF 2 : 50~60%, CaO: 5~20%, SiO 2 : 20~35%, Al 2 o 3 : 5~15%, the rest are unavoidable impurities.

[0017] The consumable electrode is produced by the conventional production process. Specifically, the steel is smelted by electric arc furnace smelting and refining furnace refining and vacuum degassing, and the electrode is molded into an electrode, and then the electrode rod is annealed. Samples were taken on the consumable electrode, and the H content was detected to be 1.0ppm with special gas detection equipment.

[0018] According to the final test, the composition and mass percentage of the slag used for electroslag remelting are: CaF 2 : 58.12%, CaO: 15.78%, SiO 2 : 20.79%, Al 2 o 3 : 5.13%, and the rest are unavoidable impurities.

[0019] The consumable electrode was electroslag remelted according to the conventional process. After re...

Embodiment 3

[0021] The composition and mass percentage of the slag system used for electroslag remelting in this embodiment are designed as: CaF 2 : 50~60%, CaO: 5~20%, SiO 2 : 20~35%, Al 2 o 3 : 5~15%, the rest are unavoidable impurities.

[0022] The consumable electrode is produced by the conventional production process. Specifically, the steel is smelted by electric arc furnace smelting and refining furnace refining and vacuum degassing, and the electrode is molded into an electrode, and then the electrode rod is annealed. Samples were taken on the consumable electrode, and the H content was detected to be 1.7ppm with special gas detection equipment.

[0023] According to the final test, the composition and mass percentage of the slag used for electroslag remelting are: CaF 2 : 51.83%, CaO: 6.80%, SiO 2 : 30.85%, Al 2 o 3 : 10.38%, and the rest are unavoidable impurities.

[0024] The consumable electrode was electroslag remelted according to the conventional process. After re...

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PUM

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Abstract

The invention discloses a slag system for electroslag remelting, which belongs to the technical field of electroslag metallurgy. The composition and mass percentage of the slag system for electroslag remelting are: CaF2: 50-60%, CaO: 5-20%, SiO2 : 20-35%, Al2O3: 5-15%, and the rest are unavoidable impurities. Compared with the conventional slag material, the material of the present invention reduces the content of CaO and Al2O3, increases the percentage content of SiO2, and has low air permeability of the slag, which is beneficial to prevent hydrogenation, especially in the humid rainy season. The slag composition is conducive to keeping the slag resistance constant, and the melting point is low, and the power consumption is reduced during remelting. Deformable silicate-type inclusions with small size, thus improving the fatigue properties of the steel.

Description

technical field [0001] The invention belongs to the technical field of electroslag metallurgy, and in particular relates to a slag system for electroslag remelting. Background technique [0002] Electroslag remelting is a method of refining metal by using electrically heated slag. The slag system plays an important role in the process of electroslag remelting and has a decisive impact on the quality of electroslag ingots. At present, the slag system commonly used in production includes lime CaO and alumina powder Al 2 o 3 , lime is very easy to absorb moisture and pulverize, and the OH generated after baking 一 It is difficult to remove, or after being removed, it will quickly absorb moisture again in contact with the atmosphere during the process of entering the furnace; even if only 1% lime is hydrated, it will increase the hydrogenation of slag by 70 ppm. Alumina powder is extracted from natural bauxite, after chemical treatment to produce Al(OH) 3 , and then dehydrate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18
Inventor 党坤会孙满臣
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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