Steel ladle composite down nozzle and preparation method thereof

Abstract

The invention discloses a steel ladle composite down nozzle and a preparation method thereof. The steel ladle composite down nozzle comprises a body and a composite body, wherein the body comprises the following raw materials in parts by weight: 88-96 parts of high alumina bauxite, 3-6 parts of graphite, 0.2-1 part of metal aluminum powder, 0.5-2 parts of metal silicon powder, and 3.0-3.5 parts ofphenolic resin; and the composite body comprises the following raw materials in parts by weight: 85-96 parts of recycled slide plates, 2-6 parts of graphite, 0.5-1 part of metal aluminum powder, 0.5-2 parts of metal silicon powder, and 3.0-3.5 parts of phenolic resin. The steel ladle composite down nozzle obtained by the method has the advantages of high-temperature resistance, good thermal shockresistance, corrosion resistance, high thermal shock strength and low production costs, and meanwhile, the preparation method is simple and convenient for expanded production. According to the invention, composite forming is adopted, the body material is adopted around a casting hole, the composite material is adopted at other parts, thus service life is guaranteed, at the same time the materialcosts are reduced, and the cost performance is relatively high.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a ladle composite drain nozzle and a preparation method thereof. Background technique [0002] The ladle lower nozzle is the molten steel conveying part, installed at the bottom of the ladle, it forms the ladle flow control system with the upper nozzle and the slide plate, and is one of the most critical flow control system functional components in the continuous casting process. The drain must have high strength, strong oxidation resistance, excellent thermal shock stability, and excellent erosion resistance. [0003] In the prior art, aluminum-carbon material is mostly used for the ladle’s lower nozzle. The conventional method is to use one material. The lower nozzle is scoured and eroded by high-temperature molten steel during use, and the casting hole of the nozzle is enlarged, and the diameter of the enlarged hole is 3-10mm. , and the thickness of t...

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Problems solved by technology

[0003] In the prior art, aluminum-carbon material is mostly used for the ladle’s lower nozzle. The conventional method is to use one material. The lower nozzle is scoured and eroded by high-temperature molten steel during use, and the casting hole of the nozzle is enlarged, and the diameter of the enlarged hole is 3-10mm. , and the thickness of the inner wall of the nozzle is at least 20mm or more. In view of this phenomenon, some manufacturers use low-grade single material, which causes the phenomenon of breakage, cracks or life reduction of the nozzle during use, and there is a greater risk

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