Method for controlling immersion depth of immersion nozzle

Abstract

The invention discloses a method for controlling the immersion depth of an immersion nozzle. The method includes the following specific content that after casting of tundish is started, a clamping rodis used for connecting the immersion nozzle preheated to 1000 DEG C with a molten steel outlet in a tundish bottom plate, then a rod body of the clamping rod is placed on a supporting part of the tundish bottom plate, the end, away from the immersion nozzle, of the clamping rod is connected with a mechanical hand adjusting the height of the immersion nozzle, and an upper identification line and alower identification line are arranged on the immersion nozzle. When molten steel of a crystallizer copper pipe enters the immersion nozzle, the molten steel liquid level can be located at the position between the upper identification line and the lower identification line on the immersion nozzle by adjusting the height of the tundish. By means of the method, the immersion depth of the immersionnozzle is determined with the upper identification line / lower identification line of the immersion nozzle adopted as the reference point, the immersion nozzle is fixed to the molten steel outlet in the tundish bottom plate through the mechanical hand and moves along with vertical moving of the tundish, and therefore the required immersion depth can be reached by the immersion nozzle.

Description

technical field [0001] The invention relates to the field of slab production, in particular to a method for controlling the immersion depth of a submerged nozzle. Background technique [0002] Continuous casting machine crystallizer copper tube submerged nozzle pouring technology is widely used in modern slab continuous casting production. The main reason is that the submerged nozzle has a significant impact on the inflow of mold slag, the floating of inclusions, the inclusion of slag, the fluctuation of the liquid level, and the uniformity of the primary shell. [0003] The immersion depth directly affects the metallurgical behavior of the molten steel in the copper tube of the mold, and is the key factor affecting the quality of the continuous casting slab and the continuous casting production. A good immersion depth is of great significance for improving and stabilizing the quality of the continuous casting slab. [0004] At present, there is a submerged nozzle patent fo...

AI Technical Summary

Problems solved by technology

[0004] At present, there is a submerged nozzle patent for controlling the immersion depth (application number 201821473376.4), and the cost of this nozzle is too high; there is another patent for an online nozzle immersion depth measurement device (application number 201820579259.X), which requires an additional device to measure the immersion depth. Increased operational workload

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