A tail billet capping method for rectangular billet continuous casting ultra-low carbon steel
A technology of ultra-low carbon steel and rectangular billet, which is applied in the field of continuous casting, can solve the problems of tail billet throwing steel, small shrinkage coefficient, and failure to output normally, and achieve the effect of ensuring normal output and meeting process requirements
Active Publication Date: 2021-02-23
ANGANG STEEL CO LTD
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Problems solved by technology
In the process of pulling the tail billet, the shrinkage coefficient of the solidified billet shell of ultra-low carbon steel is small, the oxygen of the molten steel is high, and the volume expansion causes the molten steel to surge up, which is very easy to cause the accident of tail billet steel throwing. Increasing the cooling intensity of the secondary cooling of the continuous casting machine can control the tail billet Steel is thrown away, but after overcooling, the slab is deformed and upturned seriously, and it is often impossible to output normally due to the deformation and upwarping of the slab during the output process of the tail slab
Method used
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Embodiment
[0023] Steel type: ultra-low carbon steel AGM6;
[0024] Composition: C≤0.01%, Si≤0.01%, Mn≤0.05%, P≤0.012%, S≤0.010%, Al≤0.005%, the rest is Fe and unavoidable impurities.
[0025] Rectangular billet continuous casting machine, crystallizer section: 280mm×380mm.
[0026] Tail blank capping method:
[0027] 1. When pulling the tundish in the second tail tank, the tundish liquid level starts to decrease when the liquid level is 500mm, from the standard pulling speed of 0.75m / min to 0.30min. min.
[0028] 2. When the drawing speed of the tail blank is 0.30m / min, stop the drawing straightening machine and return the drawing speed to zero. After the tundish car is driven away and the tension is stopped for 1 minute, aluminum wire segment is added to the molten steel of the tail billet in the crystallizer for deoxidation. The amount of addition is 15kg. The molten steel in the core of the tail billet molten steel in the crystallizer reacted violently, and gradually became stick...
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The invention relates to a tail billet capping method for rectangular billet continuous casting ultra-low carbon steel. After the tail tank ladle is stopped pouring, the speed is reduced when the liquid level of the tundish is 400 mm to 600 mm. Casting machine with a casting speed of 0.60m / min~1.50m / min reduced to 0.10m / min~0.30m / min allows the lowest casting speed; when the tundish stops pouring, the tundish car is driven away immediately, the casting machine pulls back to zero, and the Add the aluminum line segment to the molten steel of the tail billet in the device for deoxidation, and at the same time stir the molten steel with an oxygen tube; the time for stopping the stretching and straightening is controlled at 7 minutes to 10 minutes, and the secondary cooling water and air of the continuous casting machine are completely stopped during the stopping of the stretching and straightening; restart the stretching and leveling machine, and increase the speed until 0.80m / min~2.00m / min. The advantage is that after adopting the method of the invention, problems such as the throwing of the ultra-low carbon steel tail slab or the deformation of the cast slab are effectively suppressed, and the normal output of the tail slab is guaranteed to meet the technical requirements.
Description
technical field [0001] The invention belongs to the field of continuous casting, and in particular relates to a tail billet capping method for continuous casting of rectangular billet ultra-low carbon steel. Background technique [0002] Due to its low carbon content, ultra-low carbon (C≤0.01%) steel must be decarburized by vacuum, resulting in high oxidation of the refined top slag. The current ultra-low carbon steel types include aluminum-killed steel and oxygen-casting steel. Among them, the oxygen value of aluminum-killed steel is generally below 10ppm in molten steel, while the oxygen value of oxygen-bearing steel is generally 20-40ppm, and there is no oxygen in molten steel. Strong deoxidizing elements, when the rectangular billet is poured into the tail pot, due to reasons such as ladle slag, the tundish slag continuously transfers oxygen to the molten steel, resulting in molten steel aluminum burning and oxide inclusions increase. The total oxygen of the billet is ge...
Claims
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IPC IPC(8): B22D11/16B22D11/116
CPCB22D11/116B22D11/16
Inventor 那廷权罗建华陶功捷杨勇徐振东王映竹马升杨辉
Owner ANGANG STEEL CO LTD