Composite coating for heat-resisting alloy centrifugal casting tube

A composite coating and heat-resistant alloy technology, applied in the field of composite coatings, can solve the problems that the coating refractoriness fails to meet the use requirements, the use environment is harsh, and the performance index requirements are high. and anti-erosion, improve the effect of surface quality

Inactive Publication Date: 2010-02-17
浦杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the production of synthetic ammonia, methanol and hydrogen conversion furnace tubes, ethylene cracking furnace tubes, and high-temperature, high-pressure, heat-resistant high-gold furnace tubes for styrene steam superheating furnaces, due to the harsh operating environment and high requirements for various performance indexes, diatomite coatings or quartz Powder / diatomite composite coating, the refractoriness of the coating does not meet the requirements for use, and the erosion resistance at high temperatures is poor, the phenomenon of pipe sticking often occurs, and the outer surface of the pipe section is very rough, and the particle size of the bayberry particles exceeds the inspection requirements
[0006] As for the composite coating of quartz powder, zircon powder and bauxite, for example, Japanese patent publication Zhao 58-19376 (1983) discloses using quartz powder, zircon powder, bauxite as refractory materials, diatomite, leech Stone powder is a composite coating for centrifugal casting based on thermal insulation powder and zeolite group. This coating has poor adhesion to pipe molds, low high temperature strength, and is prone to pinhole defects, and the preparation process is complicated.
Since the coating can directly affect the surface and internal quality of the cast pipe, and change the cooling rate of the cast pipe, the use of this type of coating to produce methanol and hydrogen conversion furnace tubes and ethylene cracking furnace tubes cannot ensure the required structure and performance. , nor can it solve the particle size and uniform distribution of bayberry particles well

Method used

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  • Composite coating for heat-resisting alloy centrifugal casting tube
  • Composite coating for heat-resisting alloy centrifugal casting tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Each raw material was weighed as follows: 240kg of quartz powder, 480kg of zircon powder, 12kg of bentonite, 5kg of water glass, 2kg of magnesium oxide, 2kg of sodium dodecylbenzenesulfonate (ABS), and 260kg of water. Among them, the particle size of quartz powder and zircon powder is 325 mesh.

[0036] Prepare the paint as follows:

[0037] 1) Soak bentonite in water for more than 12 hours, and add 5% Na by weight of bentonite 2 CO 3 After the activation treatment, the bentonite slurry is obtained;

[0038] 2) Put quartz powder, 30% volume of the bentonite slurry, and water glass in a container, add half of the water and stir for 2-4 hours, and mix well to obtain a quartz powder slurry with a viscosity of 13-15 seconds;

[0039] 3) Put the zircon powder, the remaining said bentonite slurry, and magnesium oxide in another container, add the remaining water and stir for 2-4 hours, and mix well to obtain a zircon powder slurry with a viscosity of 13-14 seconds;

[004...

Embodiment 2

[0042] The raw materials were weighed as follows: 200kg of quartz powder, 200kg of zircon powder, 4kg of bentonite, 3kg of water glass, 1kg of magnesium oxide, 1kg of sodium dodecylbenzenesulfonate, and 200kg of water. Among them, the particle size of quartz powder and zircon powder is 305 mesh.

[0043] The coating was prepared according to the steps of Example 1, and the viscosity of the coating after testing with a Ford 3# flow cup was 12-13 seconds.

Embodiment 3

[0045] The raw materials were weighed as follows: 60kg of quartz powder, 70kg of zircon powder, 1.5kg of bentonite, 0.8kg of water glass, 0.3kg of magnesium oxide, 0.3kg of sodium cetylsulfonate, and 40kg of water. Among them, the particle size of quartz powder and zircon powder is 345 mesh.

[0046] The coating was prepared according to the steps of Example 1, and the viscosity of the coating after testing with a Ford 3# flow cup was 12-13 seconds.

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Abstract

The invention discloses a composite coating for a heat-resisting alloy centrifugal casting tube, which comprises the following components by weight part: 20-60 parts of quartz powder, 20-70 parts of zircon powder, 0.4-1.5 parts of suspending agent, 0.3-0.8 part of binding agent, 20-40 parts of carrier, 0.1-0.3 part of magnesium oxide and 0.1-0.3 part of activating agent. In the invention, the centrifugal casting tube which has favorable appearance and evenly-distributed waxberry particles is obtained as the composite coating containing quartz powder and zircon powder is adopted; meanwhile, theinherent quality of tube sections is improved, the heat transferring effect of furnace tubes while in use is enhanced; and the composite coating is mainly used in coating processes of reformer tubesand ethylene cracking furnaces in petrochemistry.

Description

technical field [0001] The invention relates to a composite paint for heat-resistant alloy centrifugal casting pipes, in particular to a composite paint used in the manufacturing process of high-temperature industrial furnace pipes such as petrochemical conversion furnace pipes and ethylene cracking furnace pipes. Background technique [0002] The high-alloy reforming furnace tubes, ethylene cracking furnace tubes and other high-temperature industrial furnace tubes used in my country's petrochemical industry are heat-resistant alloy cast tubes produced by centrifugal casting process. These furnace tubes work at a high temperature of 800-1200°C all the year round, and the inside and outside of the furnace tubes are filled with high-pressure corrosive media, so the service conditions are very harsh. In centrifugal casting production, such as centrifugal casting pipe, every time a casting pipe is produced, paint should be sprayed once. The paint is sprayed on the inner cavity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26B22C3/00B22D13/02C04B14/06C04B14/04
Inventor 浦杰
Owner 浦杰
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