Low-carbon aluminum-containing steel and smelting control method thereof
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A control method, aluminum steel technology, applied in the field of iron and steel smelting, can solve the problems of affecting steel quality, nozzle nodules, unable to realize multi-furnace continuous pouring, etc.
Pending Publication Date: 2021-02-05
SGIS SONGSHAN CO LTD
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[0006] The purpose of the embodiments of the present application is to provide a low-carbon aluminum-containing steel and its smelting control method, which aims to improve the poor pouring performance of molten steel in the existing low-
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Embodiment 1
[0113] For the production of a certain steel type, the composition control requirements of the finished product are: C: 0.04-0.07%, Si: ≤0.08%, Mn: 0.15-0.25%, Als: 0.010-0.025%, P: ≤0.025%, S: 0.025%.
[0114] The specific steps are: the carbon at the end of the converter is controlled at 0.08%, the tapping temperature is ≥ 1640°C, VD treatment is performed, the high vacuum time is 8 minutes, the oxygen is fixed at the end of VD, and Al is adjusted to 0.025%. Then LF treatment, LF added lime 5.5kg / t, synthetic slag 8.5kg / t. And control the composition of refining slag to include: CaO 60-65%, SiO 2 ≤6%, Al 2 o 3 30~35%, MgO 3~8%, TFe+MnO≤1.0%; refining slag alkalinity≥10. After the slag is melted, 0.5kg / t of aluminum particles are added through the silo, and 0.8kg / t of aluminum particles are added by hand. During this process, argon gas is blown from the bottom, and the flow rate of argon gas is controlled at 30Nm 3 / h. Raise the temperature to 1580°C for strong stirring...
Embodiment 2
[0116] For the production of a certain steel type, the composition control requirements of the finished product are: C: 0.05-0.07%, Si: ≤0.08%, Mn: 0.35-0.50%, Al: 0.025-0.040%, P: ≤0.025%, S: 0.025%.
[0117] The specific steps are: the carbon at the end of the converter is controlled at 0.12%, the tapping temperature is ≥1640°C, VD treatment is performed, the high vacuum time is 12 minutes, the oxygen is fixed at the end of VD, Al is adjusted to 0.025%, and then LF treatment is performed, and 4.5kg of lime is added to LF / t, synthetic slag 6.5kg / t, and control the composition of refining slag including: CaO 60-65%, SiO 2 ≤6%, Al 2 o 3 30~35%, MgO 3~8%, TFe+MnO≤1.0%; refining slag alkalinity≥10. After the slag is melted, 0.4kg / t of aluminum pellets are added through the silo, and 0.6kg / t of aluminum pellets are thrown by hand. During this process, argon gas is blown from the bottom, and the flow rate of argon gas is controlled at 60Nm 3 / h. Before sampling 1, the tempera...
Embodiment 3
[0119] It is basically the same as that of Example 1, except that the VD ends the oxygen determination, and the Al is adjusted to 0.020%.
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Abstract
The invention relates to the field of steel smelting, in particular to low-carbon aluminum-containing steel and a smelting control method thereof. The method comprises the following steps of controlling the endpoint carbon content in molten steel to range from 0.08 percent to 0.12 percent during converter tapping; carrying out decarburization treatment on the molten steel by adopting a vacuum degassing process; adding aluminum into the molten steel for carrying out deoxidation; and after refining is finished, conducting calcium treatment on the molten steel. The carbon content in the converterendpoint molten steel is controlled to range from 0.08 percent to 0.12 percent , so that the oxidability of the molten steel and the erosion of the high-temperature molten steel to a furnace lining are reduced, and the service life of a converter is prolonged. Meanwhile, an oxygen source can be brought to natural decarburization under the subsequent vacuum degassing condition, and conditions arecreated for VD natural decarburization. A VD treatment process is adopted for decarburization, so that carbon is lower after decarburization is finished. The aluminum is added for deoxidation, so thatthe deoxidation efficiency can be improved, and the deoxidation speed is high. The deoxygenation of refining slag is facilitated. After LF treatment is finished, the molten steel is subjected to calcium treatment, inclusions can be subjected to denaturation treatment, so that low-melting-point calcium aluminate is formed, and the castability of the molten steel is improved.
Description
technical field [0001] The present application relates to the field of iron and steel smelting, and in particular, relates to a low-carbon aluminum-containing steel and a smelting control method thereof. Background technique [0002] The smelting process is the key to ensure the smooth stopper curve of molten steel during pouring. If the smelting process is unreasonable, the poor purity of the molten steel during the pouring process will lead to serious nodules at the nozzle of the molten steel during the pouring process, and the stopper rod curve will rise significantly. Not only can it not realize continuous pouring in multiple furnaces, but it will also have a great impact on steel quality control. [0003] At present, the conventional process mainly includes the following contents: [0004] Patent CN201610594212 discloses a molten steel smelting process for preventing nozzle nodulation during the pouring process of sulfur-containing and aluminum-containing steel. It dis...
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