Method for controlling cleanliness of molten steel, and smelting control method capable of preventing molten steel gap from nodulation during sulphur and aluminum contained steel pouring
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A cleanliness and molten steel technology, applied in the field of smelting, can solve the problems of low cleanliness of molten steel and easy nodules at the nozzle
Inactive Publication Date: 2020-05-19
SGIS SONGSHAN CO LTD
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[0010] Based on the above-mentioned deficiencies, the present application provides a method for controlling the cleanliness of molten steel, a smelting control method for preventing nodules in the pouring process of sulfur-containing and aluminum-containing steel, so as to partially or completely improve or even solve the cleanliness of molten steel in related technologies. Low, prone to nodules at the nozzle
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Embodiment 1
[0098] For the production of a certain steel containing sulfur and aluminum, the composition control requirements of the finished product are: C: 0.19-0.21%, Si: 0.20-0.30%, Mn: 0.70-0.80%, Cr: 0.80-0.90%, Als; 0.010-0.030 %, target 0.015%, P: ≤0.025%, S: 0.020-030%.
[0099] Its smelting process is as follows:
[0100] The blast furnace molten iron is transferred to the converter for smelting without pretreatment and desulfurization, and the carbon at the end of the converter is controlled at 0.08-0.15%.
[0101]Add 2.3kg / t of aluminum and iron to 1 / 3 of the tapping, add C, Si, Mn, Cr alloy elements to adjust the composition of molten steel to the lower limit of the range, add 3.0kg / t of slag lime to the 3 / 4 of tapping, and synthesize Slag 2.5kg / t. The slag material is added during the tapping process to remove impurities through slag washing, and to keep warm during transportation to the LF refining furnace.
[0102] 2.0kg / t of lime and 4.5kg / t of low-alkalinity slag are ...
Embodiment 2
[0106] For the production of a certain steel containing sulfur and aluminum, the composition control requirements of the finished product are: C: 0.34-0.38%, Si: 0.60-0.75%, Mn: 0.95-1.05%, Cr: 0.10-0.0.25%, V: 0.25 ~0.35%, Als: ≤0.030%, P: ≤0.025%, S: ≤0.040~0050%.
[0107] Concrete process steps are:
[0108] The blast furnace molten iron is smelted in the converter, and the carbon at the end of the converter is controlled at 0.08-0.25%. Specifically, 1 / 3 of the tapping is added with 1.5kg / t of aluminum and iron, 2 / 3 of the tapping is added with C, Si, Mn, Cr, V and other alloying elements to adjust the composition of molten steel to the lower limit of the range, and 3 / 4 of the tapping is added with slag Lime 3.0kg / t, synthetic slag 2.5kg / t.
[0109] The steel from the converter is transferred to the LF refining furnace, and the refining furnace is added to the station to add 2.0kg / t of lime, 4.5kg / t of low-alkalinity slag, and add 0.8kg / t of slag surface composite deoxidi...
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Abstract
The invention discloses a method for controlling cleanliness of molten steel, and a smelting control method capable of preventing a molten steel gap from nodulation during sulphur and aluminum contained steel pouring, and belongs to the field of smelting. The method for controlling cleanliness of the molten steel comprises the following steps that blast furnace molten iron without desulfuration issubjected to converter smelting, and during converter tapping, deoxygenation, alloying and tapping wash heat are carried out in sequence for carrying out inclusion removal treatment. Through an LF furnace, converter tapping is subjected to refining under the condition that acid soluble aluminum is not adjusted, that is, during tapping, a slagging constituent is added for controlling refining slagcomposition, and after the slag is dissolved, deoxygenation is carried out through a deoxidizing agent. Through the process, the content of sulphur in the molten steel is monitored, ferrous sulfide is used for adjusting the content of sulphur in the molten steel to the first target value, an RH furnace is used for refining LF furnace tapping, in the process, according to the content of the acid soluble aluminum of LF furnace tapping, selective aluminum feeding is carried out to adjust the content of the aluminum to the second target value, and after RH furnace refining is finished, calcium treatment is carried out. According to the process, the cleanliness of the molten steel can be improved, the nodulation problem during molten steel pouring can be avoided, and the stopper bar curve rising can be controlled.
Description
technical field [0001] The present application relates to the field of smelting, in particular, to a method for controlling the cleanliness of molten steel, and a smelting control method for preventing nozzle nodules during pouring of sulfur-containing and aluminum-containing steel. Background technique [0002] The smelting process of smelting sulfur-containing and aluminum-containing steel is the key to ensure the smooth stopper curve of molten steel during pouring. If the smelting process is unreasonable, the purity of the molten steel will be poor, which will lead to serious nodules at the nozzle of the molten steel during the pouring process, the rise of the stopper rod curve is obvious, the nodules at the nozzle will fall off during the pouring process, and macroscopic inclusion defects will occur, which is harmful to automotive steel. is an impermissible defect. Therefore, how to effectively control the cleanliness of molten steel and avoid the rising of the stopper ...
Claims
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