Method for preparing thin-wall composite steel pipe with ceramic lining

A ceramic-lined, composite steel pipe technology, applied in the field of preparation of thin-walled ceramic-lined composite steel pipes, can solve problems such as cracks falling off, steel pipes are easy to burn through, deformed and bent ceramic layers, etc., and achieve extended service life, not easy to burn through, The effect of improving product quality

Inactive Publication Date: 2007-10-31
南京金陶耐磨管道有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the pipe diameter less than 159mm, the wall thickness of the steel pipe can be thinner, but due to the requirements of the process, the wall thickness of the steel pipe cannot be less than 6mm, otherwise the steel pipe is easy to burn through, deform and bend, or the ceramic layer cracks and falls off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Take the raw material Fe 2 o 3 (10Kg), Al (3.44Kg), silica additive (0.56Kg);

[0013] (2) drying at 150°C for 10 hours,

[0014] (3) The mixer (model) stirs and mixes evenly;

[0015] (4) Φ114, length 1500mm, wall thickness 4mm steel pipe is loaded into the centrifuge and the center is adjusted;

[0016] (5) Put the reaction materials mixed uniformly by the mixer into Φ114 thin-walled steel pipes,

[0017] (6) rotate with centrifuge, 1500 rev / mins of rotational speed;

[0018] (7) The reaction material is ignited with a tungsten wire;

[0019] (8) Thermite reaction: Fe 2 o 3 +2Al=2Fe+Al 2 o 3 +836KJ / mol;

[0020] During the aluminothermic reaction, solid-phase forced cooling measures are taken to forcibly cool the outer surface of the Φ114 steel pipe;

[0021] (9) Stop the machine and take out the steel pipe → test (thickness of the ceramic layer is 5mm, no cracks and shedding phenomena are found in the ceramic layer, and the composite steel pipe is not ...

Embodiment 2

[0023] (1) Take the raw material Fe 2 o 3 (8.56Kg), Al (2.95Kg), silica additive (0.48Kg);

[0024] (2) drying at 200°C for 12 hours;

[0025] (3) Stir and mix evenly without a mixer (model);

[0026] (4) Φ159, length 1000mm, wall thickness 5mm steel pipe is loaded into the centrifuge and the center is adjusted;

[0027] (5) Pack the reaction materials uniformly mixed by the mixer into Φ159 thin-walled steel pipes;

[0028] (6) rotate with centrifuge, 800 rev / mins of rotating speed;

[0029] (7) ignite the reaction material with a tungsten wire; (8) carry out the thermite reaction:

[0030] Fe 2 o 3 +2Al=2Fe+Al 2 o 3 +836KJ / mol; during the aluminothermic reaction, gas and liquid forced cooling measures are taken to force the outer surface of the Φ159 steel pipe to be cooled;

[0031] (9) Stop the machine and take out the steel pipe → test (thickness of the ceramic layer is 5mm, no cracks and shedding phenomena are found in the ceramic layer, and the composite steel p...

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PUM

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Abstract

The invention discloses a thin wall ceramic substrate composite steel pipe preparing method, which comprises the following steps: taking raw material; drying; mixing homogeneously; adding reaction mass in thin wall steel pipe; cooling intensively with gaseity, liquidity and solid state; rotating by centrifugal machine; lighting reaction mass by tungsten filament; making thermite reaction; stoping to take off pipe; examing. The invention is characterized by the following: reduing the wall thickness outer layer steel pipe more than 3mm; increasing the thickness of ceramic alyer more than 3mm; reducing the producing cost more than 30%; extending durability more than three times; reducing the surface temperature of out-shell steel pipe; improving the product quality.

Description

technical field [0001] The invention relates to a preparation method of a thin-walled ceramic-lined composite steel pipe, which adopts forced cooling technology to reduce the surface temperature of the outer steel pipe after the aluminothermic reaction, so as to reduce the wall thickness of the steel pipe and increase the thickness of the inner ceramic layer. It belongs to the technical field of preparation of thin-walled ceramic-lined composite steel pipes. Background technique [0002] The basic principle of the preparation of the existing ceramic-lined composite steel pipe is to use the aluminothermic reaction: [0003] Fe 2 o 3 +2Al=2Fe+Al 2 o 3 +836KJ / mol [0004] The released heat generates a high temperature above 2800°C, making the reaction product α-Al 2 o 3 (melting point is 2040°C) and Fe (melting point is 1560°C) are both in a molten state, and at the same time, the inner wall of the steel pipe is also heated to melt a thin layer, which is integrated with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/64
Inventor 周小新钱东浩沈国琴苏娟张树格
Owner 南京金陶耐磨管道有限公司
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