Silicone-free submersed nozzle and manufacturing method thereof

Abstract

The invention relates to a silicone-free submersed nozzle and a manufacturing method thereof. The silicone-free submersed nozzle comprises a body and a slag line segment, wherein the body comprises the following components in percentage by weight: 15-35% of crystalline flake graphite, 35-55% of white corundum and 20-50% of alumina titanate, and theslag line segment comprises the following components in weight percentage: 15-25% of crystalline flake graphite, 40-75% of zirconium oxide and 0-40% of alumina titanate. According to the invention, under the condition that the thermal shock resistance and the service life of the product can not be influenced, the generation of nodulation can be relieved or prevented by the mode of preventing the generation of SiO, and the nozzle is prevented from being blocked.

Description

technical field [0001] The invention relates to a nozzle material and a manufacturing method, in particular to a silicon-free submerged nozzle of a tundish 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 the stability of continuous casting production and the quality of billet. The submerged nozzle is located between the tundish and the mold. It is the only way for the molten steel to enter the mold. It plays the role of diversion and protection of the molten steel, preventing the possibility of re-oxidation of the molten steel in contact with the oxygen in the air. At the same time, through a reasonable design The nozzle structure can prevent the unreasonable flow field when the molten steel enters the crystallizer, which will affect the quality of the steel. [...

AI Technical Summary

Problems solved by technology

[0004] In addition to mechanical damage and corrosion of aluminum carbon submerged nozzles, nodules and blockages often occur during continuous casting

Especially when casting aluminum-killed steel, it is often caused by Al in molten steel z o 3 Such as inclusions adhere to the inner wall of the nozzle and cause blockage, which affects the continuous operation of continuous casting

At the same time, due to the inclusions adhering to the inner surface of the submerged nozzle, they may fall off during the casting process and fall into the molten steel, resulting in non-metallic inclusions in the continuous casting billet, which will affect the quality of the continuous casting billet. Seriously, these slag inclusions Will be bitten into the billet shell and cause a steel breakout accident

In addition, the nodules on the inner wall of the submerged nozzle can also cause the deflection of molten steel in the mold, which also affects the quality of the slab, and the abnormal treatment after the deflection has a greater impact on the formation of slag inclusions, inclusions and accidents in the slab. worse

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