Four-hole submerged nozzle for high-speed ftsc thin slab continuous casting mold
A thin slab continuous casting and crystallizing technology, which is applied in casting melt containers, casting equipment, metal processing equipment, etc., can solve the problems of uneven temperature distribution of molten steel surface, unsuitable, unfavorable floating of non-metallic inclusions, etc. Achieve the effect of avoiding the phenomenon of slag entrainment on the molten steel surface, improving the structural strength of the material, and ensuring the surface quality
Active Publication Date: 2015-08-12
UNIV OF SCI & TECH LIAONING +1
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Problems solved by technology
Figure 7 The four-hole submerged nozzle shown in the figure directly transports the high-temperature molten steel to the liquid surface of the molten pool around the nozzle through two upward spout holes (7). The impact fluctuation of molten steel jet on the liquid surface of the molten steel pool of the mold is relatively serious, and the high temperature area of the molten steel surface in the molten pool is only concentrated around the nozzle, which makes the temperature distribution of the entire molten steel surface uneven
Figure 8 The shown is an improved four-hole submerged nozzle, relying on the upper part of the upward spout hole (7) to form a substantially horizontal flow of molten steel jet to suppress the circulation flow in the mold caused by the downward spit hole (8) of molten steel jet , so that the fluctuation of the liquid steel level in the molten pool has been improved to a certain extent, but at the same time it has also caused the negative effect of non-metallic inclusions floating up, so it is not suitable for continuous casting production of varieties of steel that require high billet cleanliness
When the casting speed of FTSC thin slab continuous casting is increased from the current 4.0-4.5m / min to 5.0-6.0m / min for high-speed production, the adverse effects of the above-mentioned existing submerged nozzles are more serious, so the existing four Hole submerged nozzle cannot adapt to FTSC thin slab high-speed continuous casting production
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[0025] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0026] See figure 1 , figure 2 , which is a structural schematic diagram of an embodiment of a four-hole submerged nozzle for a high-speed FTSC thin slab continuous casting crystallizer of the present invention, including an upper circular tubular molten steel inflow end 1, a middle flow channel 2, and a lower outflow end 3 connected in sequence, and the middle flow channel The cross-section of 2 becomes flatter and wider from the upper inlet to the lower outlet, and the lower outflow end 3 is provided with bilaterally symmetrical discharge holes 4, and a shunt fluid 5 is arranged between the discharge holes, and the discharge hole 4 is provided with The middle guide body 6 is divided into four outlet channels at the lower outflow end 3, which changes the four-hole structure adopted by most FTSC thin slab continuous casting molds at present, so...
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Abstract
The invention relates to the field of a nozzle of metallurgical continuous casting equipment and in particular relates to a four-hole submerged nozzle for a high-casting-speed flexible thin slab caster (FTSC) crystallizer. The four-hole submerged nozzle for the high-casting-speed FTSC crystallizer comprises an upper liquid steel inflow end, a middle flowing channel and a lower outflow end which are connected with one another sequentially, wherein the lower outflow end is provided with symmetric outlet holes at two sides; middle flow guide bodies are arranged in the outlet holes; four outlet channels are formed in the lower outflow end; and a division body is arranged between the outlet holes. The four-hole submerged nozzle is characterized in that an arc-shaped concave part is formed in the top surface of the division body. Compared with the prior art, the four-hole submerged nozzle for the high-casting-speed FTSC crystallizer has the beneficial effects that the lower parts of the four outlet holes are of flat structures, so that the flowing of liquid steel around the nozzle is promoted, and a solidifying blank shell is prevented from adhering to the nozzle; and the structural sizes of an inner liquid steel channel and the outflow end of the nozzle are subjected to optimal design, and the vorticity center positions of two symmetrical vortex areas formed below the four channels of the two outlets are high, so that nonmetallic impurities in the liquid steel can float up easily to be absorbed by protective slag to be removed.
Description
technical field [0001] The invention relates to the field of metallurgical continuous casting equipment nozzles, in particular to a four-hole submerged nozzle for a high-speed FTSC thin slab continuous casting crystallizer. Background technique [0002] The thickness of the slab produced by the Flexible Thin Slab Caster (FTSC) thin slab continuous casting developed by Danieli in Italy is generally between 65 and 92 mm, and the width is about 900 to 1650 mm. The FTSC thin slab continuous casting machine is different from the flat plate mold commonly used in conventional slab continuous casting machines. The mold of the FTSC thin slab continuous casting machine is similar to the CSP thin slab continuous casting machine. The wide copper plate has a continuous arc The surface formed by the transition, the whole crystallizer is "funnel-shaped", but the shape and size of the "funnel" surface of the two crystallizers are different. The increase in the upper space of the molten ste...
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IPC IPC(8): B22D41/50
Inventor 陈永范李波李轼保李涛
Owner UNIV OF SCI & TECH LIAONING