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Method for controlling content of oxygen in steel

A technology of oxygen content and molten steel, applied in the field of iron and steel metallurgy, can solve the problems of inability to achieve metallurgical effect, difficulty in floating inclusions, deterioration of steel quality, etc., to avoid re-contamination, reduce the probability of inclusions, and improve casting performance.

Inactive Publication Date: 2011-11-09
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method of using aluminum for pre-deoxidation, deep deoxidation of LF furnace feeding aluminum wire, and final deoxidation with aluminum, aluminum is used for deoxidation. The problem is that it is easy to form fine Al in steel. 2 o 3 Inclusions, and fine Al 2 o 3 It is difficult for inclusions to float up and become difficult to remove
However, if the amount of calcium added is insufficient, it is easy to generate calcium aluminate inclusions with high melting point; on the contrary, if too much calcium is added, it will produce CaS with high melting point that is more difficult to remove, which will not only fail to achieve the expected metallurgical effect, but will deterioration of steel quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Steelmaking using 70-ton high-impedance ultra-high power electric arc furnace, the process steps are as follows:

[0038] 1) Initially making molten steel in the electric furnace;

[0039] 2) During the tapping process, add a deoxidizer to the ladle for pre-deoxidation, and use bottom blowing argon to stir. The added deoxidizer is aluminum and silicon-aluminum-barium-calcium, and 2.3Kg of aluminum and 2.2Kg are added per ton of steel. Of silicon aluminum barium calcium;

[0040] 3) Lift the ladle containing molten steel to the refining station of the LF furnace, and no longer feed the aluminum wire for deoxidation. Add 12Kg of synthetic slag per ton of steel and heat it to create slag. Add 0.45Kg of calcium carbide per ton of steel for enhanced deoxidation. White slag is formed quickly, the total amount of FeO and MnO in the slag is 0.33wt%, and the slag basicity (%CaO / %SiO 2 ) Controlled at 5.5, the slag contains 28wt% Al 2 O 3 ;

[0041] 4) After the white slag retention tim...

Embodiment 2

[0045] Steelmaking using 70-ton high-impedance ultra-high power electric arc furnace, the process steps are as follows:

[0046] 1) Initially smelting molten steel in the electric furnace;

[0047] 2) During the tapping process, add a deoxidizer to the ladle for pre-deoxidation, and use bottom blowing argon to stir. The added deoxidizer is aluminum and silicon-aluminum-barium-calcium, and 2.5Kg of aluminum and 2.5Kg are added per ton of steel. Of silicon aluminum barium calcium;

[0048] 3) Lift the ladle containing molten steel to the refining station of the LF furnace, no longer feed the aluminum wire for deoxidation, add 13Kg of synthetic slag per ton of steel and heat it to create slag, and add 0.6Kg of calcium carbide per ton of steel for enhanced deoxidation. White slag is formed quickly, the total amount of FeO and MnO in the slag is 0.45wt%, and the slag basicity (%CaO / %SiO 2 ) Controlled at 5.9, the slag contains 32wt% Al 2 O 3 ;

[0049] 4) After the white slag retention ti...

Embodiment 3

[0053] Steelmaking using 70-ton high-impedance ultra-high power electric arc furnace, the process steps are as follows:

[0054] 1) Initially making molten steel in the electric furnace;

[0055] 2) During the tapping process, add a deoxidizer to the ladle for pre-deoxidation, and use bottom blowing argon to stir. The added deoxidizer is aluminum and silicon-aluminum-barium-calcium. Add 2.6Kg of aluminum and 2.0Kg per ton of steel. Of silicon aluminum barium calcium;

[0056] 3) Lift the ladle containing molten steel to the refining station of the LF furnace, and no longer feed the aluminum wire for deoxidation. Add 14Kg of synthetic slag per ton of steel and heat it to create slag, and add 0.7Kg of calcium carbide per ton of steel for enhanced deoxidation. White slag is formed quickly, the total amount of FeO and MnO in the slag is 0.40wt%, and the slag basicity (%CaO / %SiO 2 ) Controlled at 6.4, the slag contains 34wt% Al 2 O 3 ;

[0057] 4) After the white slag retention time is 20...

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PUM

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Abstract

The invention discloses a method for controlling the content of oxygen in steel. The method comprises the following steps: primarily smelting molten steel; adding an aluminiferous deoxidizer in a ladle in the tapping process for pre-deoxidation, and stirring by using an argon bottom blowing mode; carrying out ladle furnace refining, heating and slagging, and then adding a diffusion deoxidizer forenhanced deoxidation so as to rapidly form white slag; carrying out calcium line feeding treatment on molten steel; carrying out vacuum treatment, and then softly blowing argon; and stopping blowing the argon on the molten steel for killing treatment, purifying the molten steel and then carrying out continuous casting. According to the method, the re-pollution of the molten steel can be avoided, the probability of forming fine Al2O3 inclusions can be lowered, and the pouring property of the molten steel can be improved.

Description

Technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and relates to a method for controlling the oxygen content in steel. Background technique [0002] In recent years, users' demand for pure steel has increased. The high oxygen content in steel means that the cleanliness of the steel is low, and there are more non-metallic inclusions in the steel. Non-metallic inclusions will reduce the plasticity, toughness and fatigue properties of steel, and deteriorate the cold and hot workability of steel and even some physical properties. Therefore, not only the oxygen content in the steel must be controlled very low, but also the Al in the steel must be strictly controlled. 2 O 3 Inclusions, while less Al 2 O 3 Inclusions are also the key to achieve low superheat casting during continuous casting. Therefore, controlling the oxygen content in steel and the composition, morphology, size and distribution of inclusions is an important content of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/10
Inventor 王海兵苏雄杰张珉王鑫
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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