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Method for preparing ceramic coating for replacing refractory coating prepared with centrifugal cast-steel pipe thermal mold method

A technology of ceramic coating and centrifugal cast steel, applied in the direction of pipes, rigid pipes, mechanical equipment, etc., can solve the problems of affecting the health of workers in the production and working environment, the proportion of paint is large, and the production efficiency is low, and achieves good thermal shock resistance and The effect of slag corrosion resistance, high temperature mechanical strength and wear resistance, and good volume stability

Active Publication Date: 2013-01-23
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the production process of the traditional centrifugal cast steel pipe hot mold method, the paint needs to be sprayed once for each billet produced, and the residual paint on the inner surface of the pipe mold needs to be cleaned after the pipe is pulled out. Continuous production, low production efficiency
For thin-walled tube blanks, the coating accounts for a large proportion of the production cost, which increases the production cost. Since the coating contains initiating adhesives, these adhesives will generate a large amount of gas under the action of high-temperature molten steel , casting defects such as air pits and pinholes on the billet will affect the appearance quality of the billet, especially for thin-walled billets, these defects are the main cause of waste products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Take each component according to the following Table 1 and mix them uniformly to prepare the ceramic coating raw material.

[0019] (2) Add 15.9kg of water to the ceramic coating raw material to make a slurry.

[0020] (3) Keep the rotating speed of the pipe mold at 250rpm, and flow coat the above slurry on the inner surface of the pipe mold within 2 minutes.

[0021] (4) Heat the pipe mold at 100°C for 1 hour until the free water is completely evaporated, and the ceramic coating semi-finished product is completely solidified.

[0022] (5) Keep the rotation speed of the pipe mold at 220rpm, sinter the above ceramic coating semi-finished product with high-temperature molten steel at 1300°C for 4 minutes, and wait for all the crystal water in it to be released to obtain the above hot mold for replacing the centrifugal cast steel pipe Ceramic coatings for refractory coatings.

Embodiment 2

[0024] (1) Take each component according to the following Table 1 and mix them evenly to prepare ceramic coating raw materials.

[0025] (2) Add 22.8kg of water to the ceramic coating raw material to make a slurry.

[0026] (3) Keep the rotation speed of the pipe mold at 300rpm, and flow coat the above slurry on the inner surface of the pipe mold within 4 minutes.

[0027] (4) Heat the tube mold at 150°C for 0.5 hours until the free water is completely evaporated, and the ceramic coating semi-finished product is completely solidified.

[0028] (5) Keep the rotation speed of the pipe mold at 180rpm, sinter the above semi-finished ceramic coating with 2000°C high-temperature molten steel for 7 minutes, and wait for all the crystal water in it to be released to obtain the above hot mold for replacing the centrifugal cast steel pipe Ceramic coatings for refractory coatings.

Embodiment 3

[0030] (1) Take each component according to the following Table 1 and mix them evenly to prepare ceramic coating raw materials.

[0031] (2) Add 17kg of water to the ceramic coating raw material to make a slurry.

[0032] (3) Keep the rotational speed of the pipe mold at 280rpm, and flow coat the above slurry on the inner surface of the pipe mold within 4 minutes.

[0033] (4) Heat the tube mold at 130°C for 0.75 hours until the free water is completely evaporated, and the ceramic coating semi-finished product is completely solidified.

[0034] (5) Keep the rotation speed of the pipe mold at 200rpm, and sinter the semi-finished product of ceramic coating with high-temperature molten steel at 1620°C for 5 minutes. After all the crystal water in it is released, the above hot mold for replacing the centrifugally cast steel pipe is obtained. Ceramic coatings for refractory coatings.

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Abstract

The invention discloses a method for preparing a ceramic coating for replacing a refractory coating prepared with a centrifugal cast-steel pipe thermal mold method. The method comprises the following steps of: adding water into a ceramic coating raw material to obtain slurry; coating the slurry onto the inner surface of a pipe mold in a flowing way; heating the pipe mold at low temperature for fully evaporating free water; and after the coating is solidified fully, sintering with high-temperature molten steel till crystal waster is released fully to obtain the ceramic coting for replacing therefractory coating prepared with the centrifugal cast-steel pipe thermal mold method. The ceramic coating prepared with the method has the advantages of lowering the production cost, realizing continuous production and not influencing the pipe blank quality.

Description

technical field [0001] The invention relates to a preparation method of a ceramic coating, in particular to a preparation method of a ceramic coating which replaces the thermal mold refractory coating of a centrifugally cast steel pipe. Background technique [0002] During the production process of the traditional centrifugal cast steel pipe hot mold method, the paint needs to be sprayed once for each billet produced, and the residual paint on the inner surface of the pipe mold needs to be cleaned after the pipe is pulled out. Continuous production, low production efficiency. For thin-walled tube blanks, the coating accounts for a large proportion of the production cost, which increases the production cost. Since the coating contains initiating adhesives, these adhesives will generate a large amount of gas under the action of high-temperature molten steel , Casting defects such as air pits and pinholes are produced on the tube blank, which affects the appearance quality of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L9/14C04B35/66C04B35/622
Inventor 朱伟武贤王黎辉申勇
Owner XINXING DUCTILE IRON PIPES CO LTD
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