Tundish flow control device and method
A tundish and orifice technology, which is applied in the direction of casting molten material container, metal processing equipment, casting equipment, etc., can solve the flocculation of the upper nozzle and submerged nozzle of the tundish, which affects the smooth progress of continuous casting production, and the surface defects of the slab To achieve the effect of stabilizing the quality of continuous casting slabs, reducing the probability of flocculation and improving the cleanliness
Inactive Publication Date: 2016-06-29
ANGANG STEEL CO LTD
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Problems solved by technology
Especially in the low liquid level pouring state, inclusions or covering agents are inevitably involved in the molten steel, and these slag inclusions are involved in the crystallizer and have no time to float up, resulting in surface defects of the slab; when the pouring is ultra-low For carbon steel and aluminum deoxidized steel, due to Al in molten steel 2 o 3 The inclusions cannot be completely removed, and the tundish upper nozzle and submerged nozzle are often flocculated, which directly affects the smooth progress of continuous casting production
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[0020] The flow control device 2 of the tundish is a hollow cylindrical structure as a whole, the top of the cylinder is closed, the degree of the cylinder is 350-450 mm, the thickness of the top and the side wall is 8-10 mm, and the inner diameter of the cylinder is 4 times the inner diameter of the upper nozzle of the tundish. ~8 times, the top and side walls of the cylinder are made of aluminum-zirconium carbonaceous materials. Four rows of flow control holes 3 are arranged at equal intervals along the tangential direction of the inner wall of the cylinder. The first row of flow control holes 3 is 100mm away from the top surface of the cylinder, and the fourth row is 50mm away from the bottom surface of the cylinder. The cross-sectional shape of the flow control holes 3 is a circle. The total area of the flow control holes 3 is 10 times the cross-sectional area of the inner cavity of the upper nozzle 5 of the tundish 1. The outer wall of the cylinder is wrapped with a t...
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Abstract
The invention provides a tundish flow control device and method. The flow control device is in the shape of a hollow cylinder, the top face of the device is sealed, at least two rows of flow control holes are formed at equal intervals in the tangential direction of the circumference of the inner wall of the cylinder, and the outer wall of the cylinder is wrapped with a thin shell. The flow control device is arranged on an upper nozzle in a covering mode. In the early stage of molten steel pouring, large-particle inclusions in molten steel are blocked outside the flow control device and cannot directly enter a crystallizer, vortexes are prevented from being generated above the upper nozzle, and a covering agent is also prevented from being involved in the molten steel, so that the cleanliness of a first billet is improved. After the molten steel poured into a tundish reaches a certain height, the thin shell is gradually molten, rotational flow is formed in the flow control device by the molten steel which enters in the tangential direction, the staying time of the molten steel in the tundish is prolonged, the inclusions float further, part of the inclusions in the molten steel are adsorbed by walls of the flow control holes, and therefore flocculation flow of the upper nozzle and flocculation flow of an immersion nozzle of the tundish are restrained; the steel is purified, continuous pouring can be achieved, and the molten steel yield is increased.
Description
technical field [0001] The invention belongs to the field of continuous casting, and in particular relates to a device and a method for controlling the flow of molten steel in a tundish to remove inclusions and preventing flocculation at a nozzle. Background technique [0002] The development of clean steel requires that the tundish not only control the temperature, composition and flow rate of molten steel, but also improve the cleanliness of molten steel in the container as much as possible. In order to achieve this goal, various steel mills have carried out a lot of research work and achieved good results. Among them, the most widely used means are to install turbulence in the tundish, retaining wall, fire tundish filter, etc. The role of the turbulence device is to control the strong turbulent flow caused by ladle injection in the turbulent flow area, and remove the deoxidation products, ladle slag and secondary oxidation products of the converter as much as possible, s...
Claims
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Inventor 吕志升栗红康伟张晓光廖相巍曹亚丹孙群赵晨光
Owner ANGANG STEEL CO LTD