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A kind of preparation method of reinforced boiler tube

A boiler tube and cladding technology, applied in the field of mechanical processing, can solve the problems of easy falling off, poor use effect, difficult to popularize and use, etc., and achieve the effect of improving high temperature resistance and reducing production cost

Active Publication Date: 2017-12-29
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the first method is difficult to popularize and use in practice due to its complex structure and reduced boiler thermal efficiency; the second method, because the sprayed wear-resistant hard material is mechanically combined with the boiler tube wall, is extremely easy to burn under pressure. Falling off, the actual production effect is very poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The surface of the boiler tube is derusted and decontaminated, and cleaned with alcohol, and then the surface of the boiler tube is tested by coloring non-destructive testing. The surface of the boiler tube has no defects such as cracks and pores; the mass percentage is: C: 9%, Ni: 11%, Cr: 80%, prepare cermet alloy powder; use semiconductor fiber laser and four-axis linkage CNC machining machine for cladding, adopt gravity preset powder feeding method, adjust powder feeding amount 60g / min, and carry out the above boiler tube Coating, laser power P = 1000W, scanning speed V = 1000mm / min, circular spot diameter size of 2mm, lap rate of 25%, so that a uniform and dense 0.3mm laser cladding alloy layer is formed on the surface of the boiler tube; coloring is adopted Non-destructive testing is used to detect the surface of the boiler tube after cladding, and there are no defects such as cracks and pores.

Embodiment 2

[0020] The surface of the boiler tube is derusted and decontaminated, and cleaned with alcohol, and then the surface of the boiler tube is tested by coloring non-destructive testing. The surface of the boiler tube has no defects such as cracks and pores; the mass percentage is: C: 11%, Ni: 14%, Cr: 75%, prepare cermet alloy powder; use semiconductor fiber laser and four-axis linkage CNC machining machine for cladding, adopt gravity preset powder feeding method, adjust the powder feeding amount to 70g / min, and carry out the above boiler tube Coating, laser power P = 1150W, scanning speed V = 1200mm / min, circular spot diameter size of 2mm, lap rate of 25%, so that a uniform and dense 0.35mm laser cladding alloy layer is formed on the surface of the boiler tube; coloring is adopted Non-destructive testing is used to detect the surface of the boiler tube after cladding, and there are no defects such as cracks and pores.

Embodiment 3

[0022] The surface of the boiler tube is derusted and decontaminated, and cleaned with alcohol, and then the surface of the boiler tube is tested by coloring non-destructive testing. The surface of the boiler tube has no defects such as cracks and pores; the percentage by mass is: C: 10%, Ni: 12%, Cr: 78%, prepare cermet alloy powder; use semiconductor fiber laser, four-axis linkage CNC processing machine tool for cladding, adopt gravity preset powder feeding method, adjust the powder feeding amount of 90g / min, and carry out the above-mentioned boiler tube Coating, laser power P = 1550W, scanning speed V = 1400mm / min, circular spot diameter size of 2mm, lap rate of 25%, so that a uniform and dense 0.45mm laser cladding alloy layer is formed on the surface of the boiler tube; coloring is adopted Non-destructive testing is used to detect the surface of the boiler tube after cladding, and there are no defects such as cracks and pores.

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PUM

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Abstract

The invention provides a preparation method of an enhanced boiler tube. The preparation method comprises the following steps: (1) pretreating a surface of a boiler tube; (2) performing non-destructive testing on the surface of the boiler tube and requiring that the surface of the boiler tube has no defects such as crack, pore and so on; (3) preparing a metal ceramic alloy powder in percentage by mass: 9-11% of C, 10-16% of Ni and 75-80% of Cr; (4) carrying out semiconductor fiber laser cladding to form an even and dense laser clad high-temperature wear resistant alloy layer 0.3-1.0mm thick on the surface of the boiler tube under the following parameters: laser power P=1000-1750W, a scanning speed V=1000-2400mm / min, a diameter size of a circular light spot bing 2mm, and an overlap rate being 25%; and (5) performing non-destructive testing on the clad boiler tube. According to the enhanced boiler tube prepared by use of the preparation method, the high-temperature wear resistance of the boiler tube is remarkably improved and the service life of the boiler tube is remarkably prolonged, and the production cost of an enterprise is reduced and the product quality is improved.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a preparation method of a boiler tube. Background technique [0002] Boiler tube leakage has long been one of the main reasons for forced shutdown of thermal power plant units. The superheater, reheater, water wall, economizer, etc. are referred to as boiler four tubes, which are the main structural parts inside the boiler. A series of changes in the structure and properties of materials occur in the process, and these changes involve complex aging and failure mechanisms such as creep, fatigue, corrosion, and erosion. The inevitable fire side corrosion, erosion and oxidation of boiler tubes during operation will cause the metal wall thickness of boiler tubes to gradually decrease with the running time, and it is easy to form an oxide layer, which will lead to deterioration of heat conduction performance, making the metal of the tube section practical. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 付宇明李田尤宏郑丽娟
Owner YANSHAN UNIV