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A kind of vacuum treatment method of high-aluminum ultra-low carbon steel

A technology of ultra-low carbon steel and vacuum treatment, applied in the direction of improving process efficiency, etc., can solve the problems of composition control and unstable calcium treatment effect, improve cleanliness and continuous pouring, stable effect, and avoid secondary oxidation Effect

Active Publication Date: 2017-03-08
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem of component control and unstable calcium treatment effect existing in the ultra-low carbon molten steel calcium treatment process existing in the prior art, and provides a method that not only improves the calcium yield, but also avoids splashing and secondary production during the calcium feeding process. Vacuum treatment method for high-aluminum ultra-low carbon steel that is oxidized, and the composition of the calcium treatment process is easy to control, and the calcium treatment effect is stable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A vacuum treatment method for high-aluminum ultra-low carbon steel, the steps of which are:

[0020] 1) First pump the vacuum in the vacuum furnace to 150Pa; after the vacuum decarburization is completed, add aluminum to the molten steel for final deoxidation, so that the oxygen content in the molten steel is within the set range, and at the same time add a refining agent to make The total amount of FeO and MnO in steel slag is 1.83wt%;

[0021] 2) Carry out alloying as usual, add desulfurizers CaO and CaF 4.5 minutes after alloying 2 , where CaO and CaF 2 The ratio is according to 3.5:1; Its addition makes the S content in molten steel be as the criterion at 0.00196wt%;

[0022] 3) After adding the desulfurizer for 16 minutes, increase the vacuum degree in the vacuum furnace to 3020Pa;

[0023] 4) Add Ca-Al alloy with a particle size of ≤60mm to the vacuum furnace, and the amount is added according to 0.68Kg / ton of steel; after the addition is completed, it is recyc...

Embodiment 2

[0027] A vacuum treatment method for high-aluminum ultra-low carbon steel, the steps of which are:

[0028] 1) First pump the vacuum in the vacuum furnace to 120Pa; after the vacuum decarburization, add aluminum to the molten steel for final deoxidation, so that the oxygen content in the molten steel is within the set range, and add a refining agent at the same time, so that The total amount of FeO and MnO in steel slag is 1.51wt%;

[0029] 2) Carry out alloying as usual, add desulfurizers CaO and CaF at 4.0 minutes after alloying 2 , where CaO and CaF 2 The ratio is according to 3.7:1; Its addition makes the S content in molten steel be as the criterion at 0.0018wt%;

[0030] 3) After adding the desulfurizer for 16.5 minutes, increase the vacuum degree in the vacuum furnace to 3500Pa;

[0031] 4) Add Ca-Al alloy with a particle size of ≤60mm to the vacuum furnace, and the amount is added according to 0.60Kg / ton of steel; after the addition is completed, it is recycled for ...

Embodiment 3

[0035] A vacuum treatment method for high-aluminum ultra-low carbon steel, the steps of which are:

[0036] 1) First pump the vacuum in the vacuum furnace to 160Pa; after the vacuum decarburization, add aluminum to the molten steel for final deoxidation, so that the oxygen content in the molten steel is within the set range, and add a refining agent at the same time, so that The total amount of FeO and MnO in steel slag is 1.23wt%;

[0037] 2) Carry out alloying as usual, add desulfurizers CaO and CaF at 4.8 minutes after alloying 2 , where CaO and CaF 2 The ratio is according to 4.0:1; Its addition makes the S content in molten steel be as the criterion at 0.00188wt%;

[0038] 3) After adding the desulfurizer for 15.8 minutes, increase the vacuum degree in the vacuum furnace to 3800Pa;

[0039] 4) Add Ca-Al alloy with a particle size of ≤60mm to the vacuum furnace, and the amount is added according to 0.72Kg / ton of steel; after the addition is completed, it is recycled for...

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Abstract

The invention discloses a vacuum treatment method for high-aluminum ultralow-carbon steel. The method includes the steps that a vacuum furnace is vacuumized to 150 Pa, and then an aluminum end deoxidizer and a refining agent are added; conventional alloying is performed, and within 5 min after alloying, a desulfurizing agent is added; 15 min after addition of the desulfurizing agent, the vacuum degree will be increased; Ca-Al alloy is added into the vacuum furnace, and cyclic treatment is performed for 5 min or longer; vacuum breaking and casting are performed. By means of the method, the calcium yield can be increased, splashing or secondary oxidation is avoided in the calcium line feeding process, ingredients are easy to control in the calcium treatment process, the calcium treatment effect is stable, the smelting period can be shortened, and through denaturation of inclusions in the steel, the cleanness and continuous casting performance of molten steel are effectively improved.

Description

technical field [0001] The invention relates to a vacuum treatment method for molten steel, in particular to a vacuum treatment method for high-aluminum ultra-low carbon steel. Background technique [0002] In the prior art, the ultra-low carbon molten steel with high aluminum content often causes nozzle blockage during the casting process, which has a great impact on the smooth flow of production. Especially for thin-slab continuous casting billets, calcium treatment is generally used to solve the problem of nozzle blockage. At present, the calcium treatment of ultra-low carbon steel is generally carried out after the vacuum treatment is completed, that is, a certain amount of calcium wire is fed to the molten steel. Due to the high content of (FeO+MnO) in the slag, the "splash" of the calcium treatment process is serious, and the calcium is collected. The rate is low, and there is secondary oxidation in molten steel, and there is nitrogen increase in molten steel, which h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10
CPCY02P10/20
Inventor 朱万军杨成威王春锋刘凯区铁吴维轩韩斌曹同友彭著刚张剑君
Owner 武汉钢铁有限公司
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