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Long nozzle in composite structure free from prewarming

A composite structure, no preheating technology, applied in the direction of casting molten material container, metal processing equipment, casting equipment, etc., can solve the problem that the service life cannot be synchronized, and achieve the effect of good thermal shock resistance and molten steel erosion resistance

Active Publication Date: 2006-07-05
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make the long nozzle have a long service life, and do not want the graphite content to be too high and do not add quartz as much as possible, so as to improve the resistance of the nozzle to the erosion and corrosion of molten steel, there is a certain contradiction between the two in the selection of material ratio
Therefore, in actual production, the reliability of use is always put in the first place, so that the service life of the long nozzle cannot be synchronized with the submerged nozzle and the overall stopper, and sometimes the long nozzle must be replaced once in a pouring cycle.

Method used

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  • Long nozzle in composite structure free from prewarming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The ingredients of the prepared preheating-free long nozzle outer layer aluminum carbon are 55% of fused white corundum, 14% of sintered alumina powder, 25% of flake graphite, 5% of silicon carbide powder, and 1% of boron carbide. The binder phenolic resin is the total ingredients. 10% by weight; the carbon-free inner layer ingredients are 70% magnesium aluminum spinel, Al 2 o 3 -MgO-TiO 2 Synthetic material 27%, its composition is Al 2 o 3 30%, MgO15%, TiO 2 55%; aluminum-silicon alloy powder 3%, aluminum-silicon sol (Al 2 o 3 Content 20%, SiO 2 Content 5%) is 5% of the total weight of the lining material. Put the above two ingredients in the kneading machine with a binder and knead them evenly. After drying at 70°C, inject them into the rubber sleeve for isostatic pressing. Pressure 140Mpa, keep pressure for 3 minutes. After forming, the green body is heat-treated at 1300°C for 6 hours under a nitrogen atmosphere in a shuttle kiln, and then processed, install...

Embodiment 2

[0017] The aluminum carbon ingredients of the outer layer of the long nozzle are 55% of brown corundum, 14% of sintered alumina powder, 25% of flake graphite, 5% of silicon carbide powder, 1% of boron carbide, and the binder phenolic resin is 10% of the total weight of the ingredients; The carbon-containing inner layer ingredients are 70% fused corundum, Al 2 o 3 -MgO-TiO 2 Synthetic material 25%, its composition is Al 2 o 3 50%, MgO10%, TiO 2 40%; metal aluminum powder 5%, aluminum sol (Al 2 o 3 Content 25%) is 5% of the total weight of the lining material. Add the above two ingredients to the kneading machine and mix them evenly with a binder. After drying at 70°C, inject them into the rubber sleeve for isostatic pressing. 140Mpa, keep the pressure for 3 minutes. After forming, the green body is heat-treated at 1300°C for 3 hours in a nitrogen atmosphere in a shuttle kiln, and then processed, installed with a metal ventilation hood, and painted with anti-oxidation pa...

Embodiment 3

[0019] The outer aluminum carbon ingredients are 55% brown corundum, 14% sintered alumina powder, 25% flake graphite, 5% silicon carbide powder, 1% boron carbide, and 10% of the total weight of the binder phenolic resin; no carbon The inner layer ingredients are magnesium aluminum spinel 25%, Al 2 o 3 -MgO-TiO 2 Synthetic material 70%, its composition is Al 2 o 3 50%, MgO5%, TiO 2 45%; aluminum-magnesium alloy powder 5%, phenolic resin is 8% of the total weight percentage of the lining ingredients. Put the above two ingredients in a kneader with a binder and knead evenly. After drying at 70°C, inject them into the rubber sleeve for isostatic pressing. The main body aluminum carbon material is injected into the outer side, and the inner lining is injected with silicon-free and carbon-free material into the inner side. Pressure 140Mpa, keep pressure for 3 minutes. After forming, the green body is heat-treated at 1200°C for 3 hours under a nitrogen atmosphere in a shuttle k...

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Abstract

The present invention belongs to a functional refractory material for continuous casting process, and provides a non-preheating long sprue with composite structure. It includes an external layer made of Al2O3-C material and a lining which contains no carbon material and is combined on the inner wall of said external layer. Said lining material is formed from metal powder additive, three-component system Al2O3-MgO-TiO2 synthetic material with low expansion coefficient, sintered or electrofused spinel and corundum, in which the content of spinel and corundum is 25-70wt%, content of Al2O3-MgO-TiO2 synthetic material is 25-70 wt% and the content of metal powder is 2-10 wt%.

Description

Technical field [0001] The invention belongs to functional refractory materials for continuous casting, and mainly relates to a long nozzle with a preheating-free composite structure for leading molten steel from a ladle into a tundish. Background technique [0002] The long nozzle is an important refractory material for continuous casting. When in use, it is connected to the nozzle under the ladle sliding nozzle mechanism to guide molten steel into the tundish to prevent molten steel from splashing and secondary oxidation. The operating conditions of the shroud are harsh: high-temperature molten steel flows directly into the nozzle at room temperature, and is subjected to extremely strong thermal shock; after the molten steel is introduced into the shroud by the sliding nozzle mechanism, the steel flow has strong erosion and corrosion on the neck of the nozzle and the tap hole. detrimental effect. In order to ensure the safe and reliable use of the shroud, in the selection...

Claims

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Application Information

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IPC IPC(8): B22D41/00
Inventor 杨彬李红霞杨金松刘国齐
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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