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

A technology for ceramic-lined and composite steel pipes is applied in the field of preparation of thin-walled ceramic-lined composite steel pipes. Stress reduction and less burn-through effect

Inactive Publication Date: 2006-09-27
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 thicknes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Example 1

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

[0013] (2) drying, temperature 150 ℃, 10 hours,

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

[0015] (4) Ф114, length 1500mm, wall thickness 4mm steel pipe into the centrifuge and adjust the center;

[0016] (5) Put the reaction material mixed by the mixer into the Ф114 thin-walled steel pipe,

[0017] (6) Adopt solid phase forced cooling measures to force cooling the outer surface of Ф114 steel pipe;

[0018] (7) Rotate with a centrifuge at a rotational speed of 1500 rpm;

[0019] (8) ignite the reaction material with tungsten wire;

[0020] (9) Carry out aluminothermic reaction: ;

[0021] (10) Stop and take out the steel pipe → inspection (the thickness of the ceramic layer is 5mm, the ceramic layer has no cracks and falling off, and the composite steel pipe is not bent and deformed) → thin-walled composite steel pipe products.

Example Embodiment

[0022] Example 2

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

[0024] (2) drying, temperature 200 ℃, 12 hours;

[0025] (3) Do not use a mixer (model) to stir and mix evenly;

[0026] (4) Ф159, length 1000mm, wall thickness 5mm steel pipe into the centrifuge and adjust the center;

[0027] (5) The reaction material after being mixed evenly by the mixer is loaded into the Ф159 thin-walled steel pipe;

[0028] (6) Take gas and liquid forced cooling measures to force cooling the outer surface of Ф159 steel pipe;

[0029] (7) Rotate with a centrifuge at a rotational speed of 800 rpm;

[0030] (8) ignite the reaction material with tungsten wire;

[0031] (9) Carry out aluminothermic reaction: ;

[0032] (10) Stop and take out the steel pipe → inspection (the thickness of the ceramic layer is 5mm, the ceramic layer has no cracks and falling off, and the composite steel pipe is not bent and deformed) → thin-walled composi...

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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] <chemistry num="001"> <chem file="200610039615_cml001.xml" / > < / chemistry> [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 ...

Claims

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Application Information

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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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