Composite tube and manufacture method thereof

A manufacturing method and composite pipe technology, which is applied in the field of composite pipes, can solve the problems of low welding pass rate, high welding difficulty, slow speed, etc., and achieve the effects of ensuring welding quality, improving welding efficiency, and reducing the amount of welding consumables

Inactive Publication Date: 2013-07-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
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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 rat...

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  • Composite tube and manufacture method thereof
  • Composite tube and manufacture method thereof
  • Composite tube and manufacture method thereof

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Embodiment Construction

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. And the features in the embodiments can be combined with each other.

[0034] Such as Figure 5 As shown, the composite pipe of the present invention includes a base pipe 1 and a corrosion-resistant alloy liner 2 arranged in the base pipe 1, the base pipe 1 is a carbon steel pipe, and the corrosion-resistant alloy liner 2 is a stainless steel pipe . The corrosion resistant alloy liner 2 is mechanically integrated in the base pipe 1 . The inner periphery of the end of the base pipe 1 is provided with a corrosion-resistant alloy surfacing layer 3, and the inner end surface of the corrosion-resistant alloy surfacing layer 3 is in contact with the end surface of the corrosion-resistant alloy liner 2, and the corrosion-resistan...

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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 ...

Claims

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Application Information

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IPC IPC(8): F16L9/02B23P15/00
Inventor 谢玉洪柯吕雄周声结李大全姜义张燕飞汪建明井元彬王文龙祁嘉朋陈大江王海高光军
Owner CHINA NAT OFFSHORE OIL CORP
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