Method for controlling clogging of continuous casting nozzle of titanium-containing IF steel
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A continuous casting nozzle and nodulation technology, which is applied in the field of iron and steel metallurgy, can solve the problems of submerged nozzles that are prone to nodules, etc., and achieve the effects of reducing the formation of inclusions, reducing liquid level fluctuations, and reducing costs
Active Publication Date: 2020-06-09
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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Problems solved by technology
Therefore, in the production of titanium-containing IF steel, in Al 2 o 3 Under the joint action of inclusions and Ti-Al-O composite inclusions, submerged nozzles are prone to nodules
Method used
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Embodiment 1
[0020] Through the implementation of a method for controlling the nodulation of the titanium-containing IF steel continuous casting nozzle, the number of single nozzle continuous casting furnaces for this pouring time is 6 furnaces, and its specific implementation scheme is as follows:
[0021] 1) The molten iron is desulfurized by KR pretreatment. After desulfurization, the sulfur mass fraction of the molten iron is 0.0003%, and the slag removal rate is 100%.
[0022] 2) In the combined top-bottom blowing of the converter, the carbon mass fraction at the end of the converter is 0.032%, and the temperature is 1691°C.
[0023] 3) When the RH arrives at the station, the carbon mass fraction of the molten steel is 0.027%, the free oxygen mass fraction of the molten steel is 0.0682%, and the molten steel temperature is 1632°C.
[0024] 4) Deep decarburization and alloying are carried out in the RH vacuum treatment process. After RH decarburization, the mass fraction of free oxyge...
Embodiment 2
[0030] Through the implementation of a method for controlling the nodulation of the titanium-containing IF steel continuous casting nozzle, the number of single nozzle continuous casting furnaces for this pouring time is 8 furnaces, and the specific implementation plan is as follows:
[0031] 1) The molten iron is desulfurized by KR pretreatment. After desulfurization, the sulfur mass fraction of the molten iron is 0.0005%, and the slag removal rate is 100%.
[0032] 2) In the combined top-bottom blowing of the converter, the carbon mass fraction at the end of the converter is 0.039%, and the temperature is 1685°C.
[0033] 3) When the RH arrives at the station, the carbon mass fraction of the molten steel is 0.032%, the free oxygen mass fraction of the molten steel is 0.0597%, and the molten steel temperature is 1627°C.
[0034] 4) Deep decarburization and alloying are carried out in the RH vacuum treatment process. After RH decarburization, the mass fraction of free oxygen ...
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Abstract
The invention discloses a method for controlling clogging of a continuous casting nozzle of titanium-containing IF steel. A technological process comprises the following steps of hot metal pretreatment and desulfurization, converter top-bottom combined blowing, RH vacuum treatment and continuous casting. During the converter top-bottom combined blowing, the mass fraction of carbon of the converterblowing end point molten steel is 0.03% to 0.04%, and the temperature is not less than 1680 DEG C. During RH arrival, the mass fraction of the carbon of the molten steel is 0.025% to 0.035%, the massfraction of free oxygen is 0.045% to 0.085%, and the temperature of the molten steel is 1620 to 1640 DEG C. After RH decarburization, the mass fraction of the free oxygen in the molten steel is 0.02%to 0.04%. After decarburization ends, Al particles and manganese metal are added first, the molten steel is circulated in a vacuum chamber for 4 to 7 times, the mass fraction of the free oxygen in the molten steel is not greater than 0.0003%, and then the FeTi alloy is added. After the alloying is complete, the molten steel is circulated in the vacuum chamber for 9 to 11 times. The MO index of the ladle slag after RH deoxidation alloying is controlled at 0.02 to 0.04. Through the implementation of the method, a problem of nozzle clogging caused by Ti-Al-O composite inclusions and Al2O3 inclusions is successfully overcome, the number of continuous casting furnaces of the single nozzle is increased from 2 to 3 furnaces to 6 to 8 furnaces, the production cost can be reduced, and the productquality is improved.
Description
technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for controlling nozzle nodulation of titanium-containing IF steel continuous casting. Background technique [0002] IF steel, due to the low content of C and N, adding a certain amount of Ti and Nb, the C and N atoms in the steel are fixed into carbides and nitrides, so that there are no interstitial atoms in the steel, also known as interstitial atomic steel. IF steel has the characteristics of low yield strength and yield ratio, high elongation, high plastic strain ratio, high work hardening index, and excellent deep drawing performance. The main components of titanium-containing IF steel are: C≤0.005%, N≤0.003%, Al: 0.03%-0.05%, Ti: 0.01%-0.1%. During the steelmaking and continuous casting process of titanium-containing IF steel, a large amount of Al is produced in molten steel due to the deoxidation and alloying operation. 2 o 3 Inclusions and...
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