Molten steel deoxidizing and carbureting method and steelmaking method

A technology of molten steel and deoxidizer, which is applied in the fields of deoxidation and carbonization of molten steel and steelmaking, can solve the problems of high energy consumption, uneven composition of molten steel, inability to determine the initial composition, etc., and achieve the effect of uniform composition

Inactive Publication Date: 2011-05-11
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, this deoxidation and carburization process will lead to incomplete melting of the deoxidizer and recarburizer, so the obtained molten steel usually contains agglomerates and lumps of deoxidizer and recarburizer, and the composition of molten steel in the ladle is not uniform
When this kind of molten steel with uneven composition enters the LF furnace for refining, the exact initial composition cannot be determined. Therefore, it is necessary to firstly carry out slagging in the LF furnace so that the unmelted deoxidizer and recarburizer are uniformly melted in the molten steel, and then determine the refined composition. The initial composition of steelmaking water
This brings great difficulties to the refining operation of the LF furnace and consumes man-hours. Moreover, the heating time required for slag removal is long and the energy consumption is high, which may easily cause equipment accidents in the LF furnace and affect normal production.

Method used

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  • Molten steel deoxidizing and carbureting method and steelmaking method

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Experimental program
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Embodiment 1

[0016] While blowing argon (argon blowing intensity is 3Nm 3 Under the condition of 1660 ℃ of molten steel with a temperature of 1660° C. from the converter into a ladle capable of accommodating 130-145 tons of molten steel, the carbon content during tapping is 0.03-0.15% by weight and the oxygen content is 400 -600ppm; Add 0.4kg / ton of molten steel with a carbon content greater than 90% by weight of a carburizer (a carburizer with a specification of 1-5mm) when tapping so that molten steel enters the ladle; when tapping 1 / 3, add Si 65 % by weight, 14% by weight of Ca, 14% by weight of Ba, 3% by weight of Al, 0.15% by weight of S, 0.04% by weight of P, and the balance is a bulk silicon-calcium-barium alloy with a specification of 10-70mm 2.5kg / ton molten steel ; The ladle is transported to the LF furnace, so that the molten steel enters the LF furnace for refining; the initial composition is detected in the LF furnace, and the initial composition is shown in Table 1, and then ...

Embodiment 2

[0020] Carry out deoxidation, carburization to molten steel according to the method for embodiment 1, difference is that tapping temperature is 1660 ℃, carbon content is 0.03-0.05% by weight, oxygen content 600-1200ppm; / 5 when adding the pre-deoxidation material composition is Si 55% by weight, Ca 16% by weight, Ba 16% by weight, Al 2% by weight, S 0.15% by weight, P 0.03% by weight, and the balance is that the specification of Fe is 10-70mm Block silicon-calcium-barium alloy 0.3kg / ton of molten steel; then add recarburizer 7.5kg / ton of molten steel; when tapping 1 / 2, add silicon-calcium-barium alloy 2.0kg / ton of molten steel with the same composition and specifications as the pre-deoxidized material; The ladle is transported to the LF furnace, so that the molten steel enters the LF furnace for refining; the initial composition is detected in the LF furnace, and the initial composition is shown in Table 1, and then slagging and refining are carried out. Among them, in order t...

Embodiment 3

[0022] Carry out deoxidation, carburization to molten steel according to the method for embodiment 2, difference is that when tapping makes molten steel enter ladle 1 / 4, add pre-deoxidation material composition and be Si 55% by weight, Ca 16% by weight, Ba16% by weight, Al 2% by weight, S 0.15% by weight, P 0.03% by weight, and the balance is 0.8kg / ton molten steel of bulk silicon-calcium-barium alloy with a specification of 10-70mm; the initial composition detected in the LF furnace is shown in Table 1.

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Abstract

The invention relates to a molten steel deoxidizing and carbureting method which comprises the step of adding a carburant and a deoxidizer to a steel ladle in sequence in the process of leading molten steel obtained by smelting to enter the steel ladle through steel tapping. The invention further provides a steelmaking method which comprises the following steps: tapping the molten steel obtained by smelting to the steel ladle, deoxidizing and carbureting the molten steel during the steel tapping process and then externally refining the molten steel after being deoxidized and carbureted, wherein the method for deoxidizing and carbureting the molten steel is the molten steel deoxidizing and carbureting method. In the deoxidizing and carbureting method, the carburant is firstly added and then reacted with oxygen in the molten steel to generate spontaneous mixing gas while the content of carbon is adjusted. Later, the added deoxidizer can be completely and uniformly mixed with the molten steel under the agitation action of spontaneous mixing gas, so that the molten steel that has uniform temperature and ingredients and satisfies the refining requirements can be obtained, so as to create good conditions for the next procedure.

Description

technical field [0001] The invention relates to a method for deoxidizing and carburizing molten steel and a method for making steel. Background technique [0002] In the steelmaking production process, the carburizing method is usually used as the control method of the converter steelmaking end point, that is, the carbon content of the steelmaking end point is controlled by adding a carburizing agent during the tapping process, so that the carbon content in the molten steel reaches the level of the steelmaking steel. within the requirements. Specifically, when the steel is tapped (that is, the molten steel flows from the converter to the ladle), a deoxidizer is first added to deoxidize and alloy the molten steel, and then when the oxygen in the molten steel reacts with various alloy components in the deoxidizer to form oxides so that When the oxygen content in molten steel is reduced to the required range (for example, less than 100ppm), a large amount of recarburizer is ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06
Inventor 杜利华雷辉邓林杨森祥黄登华解明科
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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