Composite submerged nozzle and manufacturing method thereof

Abstract

The invention provides a composite submerged nozzle. The composite submerged nozzle comprises an outer layer body, an outer-layer slag line segment and an inner layer, wherein the outer layer body comprises the following components in percentage by weight: 15-35% of crystalline flake graphite, 35-55% of white corundum, 20-50% of aluminum titanate and 8-10% of an external phenolic resin binding agent; the outer-layer slag line segment comprises the following components in percentage by weight: 15-25% of crystalline flake graphite, 45-85% of zirconium oxide, 0-30% of aluminum titanate and 8-10%of an external phenolic resin binding agent; and the inner layer comprises the following components in percentage by weight: 60-90% of aluminum titanate, 10-40% of corundum and 3-5% of an external alumina gel binding agent.

Description

technical field [0001] The invention relates to a nozzle material and a manufacturing method, in particular to a composite submerged nozzle used in continuous steel casting production and a manufacturing method thereof. Background technique [0002] Submerged nozzle is one of the most critical functional refractory materials in steel continuous casting production, and its use effect directly affects continuous casting efficiency and billet quality. The submerged nozzle is located between the tundish and the mold, and is the only way for molten steel to enter the mold. Therefore, the submerged nozzle protects the molten steel and prevents the possibility of secondary oxidation occurring again when the molten steel contacts oxygen in the air. At the same time, it is designed reasonably The unique nozzle structure can prevent unreasonable air bubbles and bias flow when the molten steel enters the mold, which will affect the quality of the steel. [0003] At present, the materi...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a composite submerged nozzle and its manufacturing method, by introducing aluminum titanate with low expansion coefficient and high thermal shock resistance to replace fused quartz and silicon carbide in the traditional submerged nozzle production materials, the modified Aluminum titanate overcomes the disadvantage of low strength of the material after sintering, so that the submerged nozzle can slow down or prevent the generation of nodules by preventing the generation of SiO without affecting the thermal shock resistance and service life of the product, preventing the nozzle from At the same time, the inner wall of the nozzle adopts a composite carbon-free layer to improve the anti-alumina deposition performance of the nozzle; in addition to preventing aluminum oxide deposition, the carbon-free material has the function of preventing metal deposition due to its low thermal conductivity. Avoid cracks when casting medium carbon steel, and have high corrosion resistance when continuously casting high oxygen steel

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