Molten steel deoxygenation method for thinning solidification structure

A technology of solidification structure and molten steel, which is applied in the field of steel smelting, can solve the problems of difficult industrial mass production, and achieve the effects of avoiding large particles of single titanium oxide, eliminating harmful effects, and reducing clogging

Active Publication Date: 2009-03-25
ANGANG STEEL CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

Since deoxidized alloys, refractory materials, and slagging agents all contain aluminum elements, these aluminum elements must be transferred to molten steel under the action of physical and chemical conditions in the steelmaking process. Therefore, in actual production, if aluminum is controlled at 0.001 % below is quite difficult, so it is not easy to achieve industrial mass production
On the other hand, since aluminum or aluminum-containing deoxidizers cannot be used for deoxidation in steelmaking using this method, the oxygen content in the steel will stay at a relatively high level, and at higher oxygen content, titanium reacts with oxygen Afterwards, large-grained titanium oxide inclusions will be formed, and large-grained titanium oxide inclusions cannot be used as heterogeneous nucleation points for refined grains

Method used

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  • Molten steel deoxygenation method for thinning solidification structure
  • Molten steel deoxygenation method for thinning solidification structure
  • Molten steel deoxygenation method for thinning solidification structure

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In MoSi 2 Carry out steel melting and deoxidation experiments in a high-temperature furnace. Before the experiment, put the corundum crucible into the furnace, and at the same time put the steel material to be melted (500g of industrial pure iron) into the corundum crucible, raise the temperature to 600°C, and open the valve of the argon gas cylinder. The bottom of the furnace is fed with high-purity argon for protection to prevent the steel material from being oxidized, and the flow rate is controlled at 1L / min. Raise the temperature to 1600°C and change to automatic constant temperature control, at this time the charge has been completely melted. When deoxidizing, first use SiAlFe alloy (0.44g) containing 28% aluminum for deoxidation, then add carbon powder (0.94g), metal manganese (9.66g), ferrosilicon (2.67g) and ferroniobium (0.34g) alloy for 60 seconds Finally, the sample before titanium treatment was taken with a quartz tube, and the oxygen activity in the steel...

Embodiment 2

[0029] Conduct steel melting and deoxidation experiments in a 200kg high-frequency induction furnace lined with magnesia refractory materials. Before the experiment, put the steel material (industrial pure iron) to be melted into the furnace, raise the temperature to 1600°C, and stop the temperature rise. The steel material has been completely melted. When deoxidizing, first use SiAlFe alloy (0.20kg) containing 28% aluminum for deoxidation, then add carbon powder (0.16kg), metal manganese (3.87kg), ferrosilicon (1.07kg) and ferroniobium (0.20kg) alloy, 200 seconds Finally, the sample before titanium treatment was taken with a quartz tube, and the oxygen activity in the steel was measured with a solid electrolyte oxygen concentration cell rapid oxygen determination probe. The oxygen activity of molten steel before adding titanium was 81×10 -6 , and then add 30% titanium-containing ferro-titanium alloy (0.56kg) for final deoxidation, incubate for 300 seconds, and take a titanium...

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Abstract

The invention provides a hot metal deoxidation method of a refinement and solidification structure, which comprises the following steps: proper amount of carbon powder, ferromanganese, ferrosilicon and other alloys are added into the molten steel to carry out deoxidizing and alloying. The method is characterized in that: before deoxidizing and alloying, proper amount of SiAlFe alloy is added to carry out pre-deoxidizing, the oxygen activity of the molten steel is controlled between 50 multiplied by 10<-6> and 100 multiplied by 10<-6> through pre-deoxidizing and deoxidizing and alloying and the temperature is controlled over 1550 DEG C; then proper amount of ferrotitanium is added to carry out final deoxidizing and aluminum content and titanium content of the steel deoxidized are respectively 0.003 percent to 0.012 percent and 0.015 percent to 0.050 percent. Under the conditions without changing the technique flow of steelmaking, adding equipment and increasing cost, the solidification structure of carbon steel can be obviously refined and isometric crystal proportion can be improved to more than 80 percent. Therefore, harmful function of alumina foreign impurities is eliminated, generation of large particles of single titanium oxide is avoided and blockage of a water gap is reduced.

Description

technical field [0001] The invention belongs to steel smelting technology, in particular to a method for deoxidizing molten steel. Background technique [0002] In the process of steelmaking, in order to remove dissolved oxygen in steel, it is usually necessary to add deoxidizers such as Si and Mn to molten steel for pre-deoxidation, and then add Al for final deoxidation. Then the deoxidized products (inclusions) are removed from the molten steel by various means. Since the inclusions formed by deoxidation are generally very small and should not float up, but continue to remain in the molten steel, it is difficult and uneconomical to pursue the purity of steel excessively to produce steel with extremely low inclusion content. In fact, inclusions cannot be completely removed from molten steel. [0003] In recent years, it has been recognized that the advantages conferred by inclusions during the solid-state transformation of steels have been recognized. If there is no effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 尚德礼吕春风
Owner ANGANG STEEL CO LTD
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