Heating structure of electromagnetic fixed-point target area of ​​tundish tank

Abstract

The invention discloses an electromagnetic fixed-point target area heating structure for a tundish tank, which solves the problems of low nozzle life, unreasonable molten steel heating area, high operating cost, easy leakage, steel overflow and other accidents existing in the existing tundish electromagnetic heating . The technical solution includes the bottom of the tundish which is composed of the working layer, the permanent layer and the bottom plate of the tundish, and the nozzle arranged at the bottom of the tundish, the outer periphery of the nozzle is provided with an annular movable seat brick above the bottom plate of the tundish, and the movable seat An annular electromagnetic induction heating device is embedded in the lower section of the brick, and the inner ring of the electromagnetic induction heating device is provided with an inner screen ring. The invention has the advantages of extremely simple structure, good control performance, convenient installation and maintenance, uniform heating of molten steel, effectively realizing constant temperature casting with low superheat, high safety and reliability, and effectively avoiding nozzle damage.

Description

technical field [0001] The invention relates to the field of molten steel smelting, in particular to an electromagnetic fixed-point target zone heating structure for a tundish. Background technique [0002] The as-cast solidification structure of the continuous casting slab usually consists of three regions, that is, the edge is a fine equiaxed chilled grain area, the adjacent columnar grain area (perpendicular to the surface of the slab and growing towards the center), and the center is equiaxed. crystal area. Generally speaking, the equiaxed crystal has a dense structure and good processing performance, while the columnar crystal has obvious directionality and poor processing performance, which is easy to cause defects such as center segregation, center looseness and center cracks. Therefore, in continuous casting slab solidification During the process, the development of columnar crystal regions should be suppressed as much as possible, and the expansion of equiaxed crys...

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Problems solved by technology

Among them, the electrode arrangement of the arc heating method is complicated, and the electrode consumption has a carburizing effect on the molten steel; the plasma heating method is difficult to maintain the plasma arc due to the unstable control of the molten steel level in the tundish, resulting in arc extinguishing and the electromagnetic radiation generated by the plasma. There is relatively large interference in the system; the electromagnetic induction heating method of the tundish is to connect the molten pool below the ladle nozzle with the molten pool above the nozzle flow with a transverse channel, and the electromagnetic induction heating method is used on this channel to transfer the molten metal flowing through the channel Metal liquid heating, this method is inconvenient to install and maintain, and it heats the entire metal liquid in the tundish, which consumes a lot of energy; the electromagnetic heating method of the tundish nozzle directly heats the nozzle of the tundish flowing through the crystallizer, which leads to The temperature of the molten steel is high, resulting in excessively developed columnar crystals of the billet, large internal cracks, segregation at the center, and serious looseness at the center, which may easily cause accidents such as leaking and steel overflow, and the continuous electromagnetic radiation to the stopper nozzle will greatly reduce the service life of the nozzle and increase Operating costs

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