Composite tube and manufacture method thereof

Abstract

The invention discloses a composite tube and a manufacture method thereof. The composite tube comprises a base tube (1) and a corrosion-resistant alloy liner tube (2) mechanically combined in the base tube, wherein a corrosion-resistant alloy surfacing layer (3) is arranged at the inner circumference of the end part of the base tube, the inner end face of the corrosion-resistant alloy surfacing layer (3) is connected with the end face of the corrosion-resistant alloy liner tube (2), and the axial length of the corrosion-resistant alloy surfacing layer (3) is not less than the distance between the end face of the corrosion-resistant alloy liner tube (2) and the end face of the base tube (1). The manufacture method comprises the following steps of: S1, mechanically combining the corrosion-resistant alloy liner tube (2) in the base tube (1); S2, removing the corrosion-resistant alloy liner tube (2) (with certain length) at the end part of the composite tube; and S3, forming the corrosion-resistant alloy surfacing layer (3) on the inner circumference of the end part of the base tube (1) from inside to outside in a surfacing manner from the end part of the corrosion-resistant alloy liner tube (2). According to the composite tube, the problems of large welding difficulty, low welding qualified rate and low speed of the dual-metal mechanical composite tube are solved.

Description

technical field [0001] The invention relates to a composite pipe, in particular to a bimetal mechanical composite pipe for transporting acidic oil and gas, and also relates to a manufacturing method of the composite pipe. Background technique [0002] The bimetallic composite pipe is composed of an outer carbon steel base pipe and an inner corrosion-resistant alloy liner in a mechanical or metallurgical manner. It organically combines the anti-corrosion performance of corrosion-resistant alloy steel with the excellent mechanical properties of carbon steel pipe. It is suitable for transporting acidic medium in high temperature and high pressure environment. Bimetallic composite pipes can be divided into bimetallic mechanical composite pipes and bimetallic metallurgical composite pipes according to their combination methods, and mechanical composite pipes are widely used due to their manufacturing and price advantages. Most of the bimetallic mechanical composite pipes on the ...

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Problems solved by technology

[0004] The purpose of the present invention is to avoid the defects of high welding difficulty, low welding qualification rate and slow speed in the prior art of bimetallic mechanical composite pipe, and provide a composite pipe and its manufacturing method

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