Immersion type rotational-flow water port for steelmaking continuous casting

Abstract

The invention discloses an immersion type rotational-flow water port for steelmaking continuous casting. The immersion type rotational-flow water port for steelmaking continuous casting comprises a water port body, and the interior of the water port body is cylindrical. A cylindrical inner cavity is formed in the water port body. The open end of the cylindrical inner cavity of the water port body is a water port inlet, and the closed end of the cylindrical inner cavity of the water port body is a water port bottom. At least three water port outlets are formed in the water port bottom and arranged on the water port wall of the water port body, and the lower ends of the water port outlets penetrate through the water port bottom. The inner side of each water port outlet communicates with the interior of the water port and deviates from the circle center of the water port bottom. The water port outlets are evenly distributed in the periphery of the water port wall. By adoption of the immersion type rotational-flow water port for steelmaking continuous casting, the molten steel fluidity and the temperature distribution state in a crystallizer are changed, and the casting blank quality is improved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, in particular to a submerged swirl nozzle for steelmaking and continuous casting. Background technique [0002] Continuous steel casting is a process of continuously casting high-temperature molten steel into one or more forced water-cooled metal cavities (molds); after solidification and forming, it is cooled again to form a certain shape (specification) billet. The quality of the slab, the flow and temperature distribution of molten steel in the mold have a decisive impact, and the continuous casting submerged nozzle structure is the key to controlling the flow and temperature distribution of molten steel in the mold. [0003] The large-section round billet continuous casting machine is mainly used for the production of wheels, heavy-duty axles and large ring parts, and has very high requirements on the quality of the cast billet. [0004] In the process of realizing the present invent...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the round billet continuous casting machine with this cross-section still uses the traditional straight nozzle; because the jet impact of the straight nozzle is relatively deep, the inclusions are not easy to float up and remove ; At the same time, due to the lack of upward streams, the molten steel surface of the mold is not active enough, and the melting of mold slag is poor, which may lead to a decline in the quality of the cast slab

In addition, due to the flow field characteristics of the straight nozzle, the molten steel in the round billet mold cannot be fully mixed, which may lead to large segregation in the center of the billet and more developed columnar crystals.

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