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Refractory material for steel-making RH refining furnace immersion tube

A technology for refractory materials and pipes, applied in the field of refractory materials, can solve the problems of decreased physical properties of refractory materials, defective SiC oxidation resistance, etc., and achieve excellent corrosion resistance, good adaptability and matching, long life and safety. Effect

Inactive Publication Date: 2019-12-03
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the oxidation resistance of SiC is defective, which will lead to a decrease in the physical properties of the refractory material during application.
Therefore, this material is not suitable for applications under RH high alkalinity slag or desulfurization conditions

Method used

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  • Refractory material for steel-making RH refining furnace immersion tube
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  • Refractory material for steel-making RH refining furnace immersion tube

Examples

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with embodiment.

[0030] Table 1 is the material composition of the examples of the present invention, and Table 2 is the performance analysis and comparison of the examples. In Table 2, *CaO in ordinary refining slag is 15-32%, **CaO in test desulfurization slag is ≥ 35%, ** *CaO≥70% in the desulfurizer, the material of comparative example 1 is the existing corundum castable, and the material of comparative example 2 is the existing aluminum-magnesium castable.

[0031] It can be seen from Table 2 that the physical performance index of the RH dipped pipe refractory material of the present invention is: bulk density after baking at 1600°C×3h ≤ 2.9g / cm 3 , compressive strength ≥ 155MPa, flexural strength ≥ 27MPa, thermal conductivity at 500°C ≤ 0.6w / m·k, thermal shock resistance at 1600°C-cold water (normal temperature) ≥ 19 times, ordinary resistance after burning at 1600°C×3h Refining slag erosion i...

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Abstract

The invention discloses a refractory material for a steel-making RH refining furnace immersion tube. The refractory material is prepared from the main components in percentage by weight: 50-68% of calcium hexaluminate particles, 0-20% of corundum fine particles, 0-15% of magnesium aluminum spinel fine powder, 0-21% of corundum fine powder, 1-4% of calcium aluminate cement, 0-10% of magnesite powder, 3-10% of active alumina micro powder and 0.3-1.0% of an addition water reduction agent. The thermal shock resistance, adiabaticity and corrosion resistance of the refractory material for the RH refining furnace immersion tube are significantly improved, and especially under the RH desulfurization refining process conditions, the immersion tube has the better life and safety.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a refractory material for dipping pipes of steelmaking RH refining furnaces. Background technique [0002] The steelmaking RH refining furnace has the characteristics of strong function, large processing capacity, short processing cycle, and high cleanliness of molten steel after processing, and has become one of the most important external refining equipment for steelmaking. The key refractory materials of the RH refining furnace are in the upper tank, middle tank, lower tank, circulation pipe and dipping pipe. When working, insert the dipping tube of the RH refining furnace into the molten steel in the ladle, so that the molten steel enters the lower tank of the RH refining furnace along the ascending tube of the dipping tube, and returns to the ladle through the descending tube of the dipping tube to form a vacuum circulation of the molten steel And p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3206C04B2235/3217C04B2235/3222C04B2235/9607
Inventor 高华甘菲芳
Owner BAOSHAN IRON & STEEL CO LTD
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