Corrosion-preventing processing method for pipe end of inner lining glass corrosion-preventing steel pipe

A technology of anti-corrosion steel pipe and treatment method, which is applied in the field of steel pipe manufacturing, can solve the problems of poor corrosion resistance of the inner surface of the weld, and achieve the effect of anti-corrosion

Inactive Publication Date: 2013-08-07
胜利油田金岛工程安装有限责任公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for pre-corrosion treatment of the pipe end of glass-lined anti-corrosion steel pipe to solve the defect of poor corrosion resistance on the inner surface of the weld

Method used

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  • Corrosion-preventing processing method for pipe end of inner lining glass corrosion-preventing steel pipe

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Embodiment Construction

[0014] The invention will be further described below in conjunction with the accompanying drawings and specific examples, but not as a limitation of the invention.

[0015] see figure 1 , before the sandblasting pretreatment in the steel pipe, use an automatic surfacing welding machine to pre-surfacing the nickel-based corrosion-resistant alloy layer 3 on the end face of the steel pipe 1 to a depth of 30-50 mm (the nickel-based corrosion-resistant alloy layer 3 is preferably Ni-Cr -Mo), with a thickness of 1.5-2 mm, which is melted on the base metal to obtain the corrosion resistance of the surfacing layer of the nozzle.

[0016] The surface of the surfacing layer is cleaned, the steel pipe is sandblasted to remove rust and purge, and then the inner anti-corrosion layer 2 of the glass is deposited; the inner anti-corrosion layer 2 of the glass covers the nickel-based corrosion-resistant alloy layer 3, and a 15-25mm welding heat-affected zone is reserved 6 .

[0017] During t...

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Abstract

The invention relates to a corrosion-preventing processing method for a pipe end of an inner lining glass corrosion-preventing steel pipe. The corrosion-preventing processing method comprises a first step of performing overlaying welding of a nickel base corrosion-resistant alloy layer in advance from the end face of the steel pipe to an inner hole with a depth of 30-50mm, and enabling the thickness of the nickel base corrosion-resistant alloy layer to be 1.5-2mm; and a second step of cleaning the surface of the nickel base overlaying welding layer surface, depositing a glass inner corrosion-preventing layer after an inner wall of the steel pipe undergoes derusting and blowing, enabling the glass inner corrosion-preventing layer to be covered on the nickel base overlaying welding layer, and reserving a welding heat affected zone of 15-25mm. Compared with the prior art, the continuous nickel base corrosion-resistant alloy protecting layer is formed on the surface of the pipe inner hole of a weld seam, the problem of corrosion of the inner surface of the weld seam is solved, continuation of the inner corrosion-preventing layer is achieved, and generation of repaired openings is avoided.

Description

technical field [0001] The invention relates to the field of steel pipe manufacturing, in particular to a pre-corrosion treatment method for the end of a steel pipe. Background technique [0002] Improving pipeline anti-corrosion technology and prolonging the service life of pipelines is one of the global technical difficulties. At present, the anticorrosion materials for metal pipelines commonly used in countries all over the world are organic polymer compounds, such as coal tar coatings, asphalt, epoxy coatings, 3-layer PE coatings, etc. Due to the existence of aging and deterioration problems, the service life of pipes coated with traditional organic coatings is shortened to varying degrees. This inherent deficiency of organic coatings often leads to catastrophic pipeline accidents (such as leaks, fires, explosions and environmental pollution), which can be described as endless troubles. Therefore, how to improve the anti-corrosion performance of pipelines has become a ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B32B37/04
Inventor 梁龙旭杨卫国井立国盖发宾吴建东李传明
Owner 胜利油田金岛工程安装有限责任公司
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