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Manufacturing method of long-life high-temperature resistant radiation pipe

A manufacturing method and high-temperature-resistant technology are applied in the field of manufacturing long-life high-temperature-resistant radiant tubes, which can solve the problems of reduced strength, low temperature resistance, and short service life of radiant tubes, and achieve reduced consumption and improved high temperature resistance. , the effect of prolonging the service life

Inactive Publication Date: 2010-12-22
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The corrosion of the air inlet of the radiant tube is relatively serious;
[0004] 2. The strength of the radiant tube is reduced at high temperature, and it is easy to deform;
[0005] 3. The gas medium will form scale on the inner wall of the radiant tube, which will affect the effect of heat exchange;
[0007] 5. The service life is not long, and it is not resistant to high temperature, so it needs to be replaced frequently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The weight percent of raw materials is 50% of silicon carbide, 30% of monocrystalline silicon, 14.7% of carbon black, 5% of polyvinyl alcohol and 0.3% of lanolin.

[0026] a, batching: prepare the raw material of aforementioned weight ratio;

[0027] b. Pulping: first add silicon carbide to distilled water, stir for 3 hours, then add elemental silicon and stir for 1 hour, then add carbon black and lanolin for stirring, then add polyvinyl alcohol solution dropwise, stir for no less than 7 hour, the slurry is evenly mixed into a paste;

[0028] c. Mold making: According to the size of the radiant tube, the physical shape is machined, and then the inner and outer molds are made;

[0029] d. Forming: grouting by solid grouting method;

[0030] e. Drying: After the molded body is demoulded, dry it in a drying room at 60°C for 72 hours;

[0031] f. Blank trimming: After the formed blank is dried, repair the defects on the surface of the blank;

[0032] g. Sintering: Put t...

Embodiment 2

[0035] The weight percent of raw materials is: 55% of silicon carbide, 25% of monocrystalline silicon, 15.7% of carbon black, 4% of polyvinyl alcohol, and 0.3% of lanolin. Others are the same as in Embodiment 1.

Embodiment 3

[0037] The difference between this embodiment and the first embodiment is that the weight percentage of each component is: 60% of silicon carbide, 20% of monocrystalline silicon, 16.7% of carbon black, 3% of polyvinyl alcohol with a pH value between 6.5 and 7.3, Lanolin 0.3%. Others are the same as in Embodiment 1.

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Abstract

The invention relates to a main heat exchange part in various high-temperature heat treatment furnace bodies, such as a carburizing furnace, a fluorinating furnace and the like in the field of iron and steel manufacture, in particular to a manufacturing method of a long-life high-temperature resistant radiation pipe, which comprises the following steps of: A. uniformly mixing the following raw materials in percentage by weight: 45-65 percent of silicon carbide, 20-30 percent of monocrystalline silicon, 10-20 percent of carbon black, 3-5 percent of polyvinyl alcohol and 0.3 percent of lanoline, and then adding water to be mixed into paste; B. injecting the pasty raw materials into a mould for molding by adopting a solid casting method; C. drying a molded blank body after being demolded; and D. placing the dried blank body into a vacuum furnace, and raising the temperature to 1800 DEG C for vacuum reaction sintering. The product prepared by the invention has the advantages of high strength, high rigidity, high-temperature resistance, corrosion resistance, good thermal shock resistance and excellent oxidation resistant performance.

Description

technical field [0001] The invention relates to the main heat exchange components in various high-temperature heat treatment furnace bodies such as carburizing furnaces and fluorination furnaces in the field of iron and steel manufacturing, in particular to a manufacturing method of long-life high-temperature-resistant radiant tubes. Background technique [0002] The radiant tube is the main heat exchange equipment for heat treatment furnaces such as heating furnaces and annealing furnaces. The burner fuel is coke oven gas, natural gas, etc. When the burner is working, the temperature of the radiant tube wall is controlled below 1000°C. The raw material of the radiant tube is weather-resistant Steel, alloy steel and stainless steel, etc. These materials are commonly used heat-resistant, corrosion-resistant, high-strength engineering materials. They are usually used as heat exchange tubes, radiant tubes and other components in industrial furnaces. In actual use, there are The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 洪学勤张良祥陈光胜韦坚雷中兴
Owner 武钢集团有限公司
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