Submersed nozzle brick capable of reducing slag entrapment of sheet billet crystallizer and using method thereof

Abstract

The invention discloses a submersed nozzle brick capable of reducing slag entrapment of a sheet billet crystallizer and a using method thereof. The submersed nozzle brick capable of reducing slag entrapment of the sheet billet crystallizer is mainly composed of a submersed nozzle brick body, a molten steel inlet end, a molten steel discharge end, a double-port discharge plate, a flow guide block and an electromagnetic field generator; and molten steel discharge side holes are formed in the two sides of the submersed nozzle brick body; the sectional area ratio of the flow guide block is increased by 8%-15%, and the shape of a partition plate between two molten steel flow outlets of the double-port discharge plate is the same as that of the lower section of the flow guide block, so that thedischarge area of the double-port discharge plate is correspondingly reduced by 8%-15%. The using method of the submersed nozzle brick comprises the following steps that during working, the end face of the molten steel discharge end is located at any position 200mm-240 mm below the liquid level in the crystallizer, the electromagnetic field intensity is 0.12T-0.20 T; when pouring is conducted, molten steel flows out of the double-port discharge plate and the molten steel discharge side holes at the same time. According to the submersed nozzle brick capable of reducing the slag entrapment of the sheet billet crystallizer and the using method thereof, under the condition of the high drawing speed of 6m / min-7m / min, the fluctuation value of the liquid level of the crystallizer is controlled tobe not larger than + / -2 mm, and the product percent of pass is increased to 98.7% from 97.6% while the efficiency of a casting machine is improved.

Description

technical field [0001] The present invention relates to a smelting equipment and its use method, which specifically belongs to a submerged nozzle brick and its usage method, especially suitable for the submerged nozzle brick and usage method of the crystallizer slag inclusion in the short process production line. Background technique [0002] With the continuous industrial upgrading and structural adjustment of the iron and steel industry, the traditional high energy consumption and high cost production mode is gradually developing towards high quality, low energy consumption and low cost. In recent years, in the face of resource and environmental constraints and increasing pressure on energy conservation and emission reduction in the iron and steel industry environment, thin slab technology has developed rapidly. Because of its huge advantages in technology and efficiency, it is widely regarded as the cutting-edge technology of the metallurgical industry and is also the The...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of mold slag entrainment caused by excessive crystallizer liquid level fluctuations under the condition of high casting speed of 6-7m / min in the existing thin slab continuous casting, and to provide a 6-7m / min Under the condition of high casting speed, the fluctuation value of the crystallizer liquid level is controlled within the range of ±2mm, thereby improving the efficiency of the casting machine, and the product pass rate is increased from 97.6% to 98.7%. Submerged nozzle brick and its use method

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