Hydrostatic pressure expanding composite technology for bimetal composite pipe

A technology of bimetallic composite pipe and composite process, which is applied in the field of bimetallic composite pipe hydrostatic pressure expansion composite technology, which can solve the problems of increased manufacturing cost, bulging, and the scrapping of the entire pipeline, and achieve pressure balance and uniform expansion pressure , Quality guaranteed effect

Active Publication Date: 2012-07-18
JIANGSU XINPENG COMPOSITE MATERIALS
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Problems solved by technology

[0009] 1. When used for compounding of slender pipes, because the deformation process of the lining pipe is too intense, it is easy to produce defects such as deformation and bulging;
[0010] 2. The process technology is complicated, and the bonding strength between layers cannot be accurately calculated and controlled;
[0011] 3. Regardl

Method used

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  • Hydrostatic pressure expanding composite technology for bimetal composite pipe
  • Hydrostatic pressure expanding composite technology for bimetal composite pipe
  • Hydrostatic pressure expanding composite technology for bimetal composite pipe

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Embodiment Construction

[0034] Theoretical basis of a bimetallic composite pipe hydrostatic pressure expansion composite process of the present invention:

[0035] According to the elastic-plastic theory of metal materials, the hydraulic expansion force and the residual contact stress calculation system between the two-layer pipes obtained after the expansion compound is established, which is used to guide the selection of the hydraulic expansion force and the evaluation of the composite process, such as figure 1 As shown, taking the 316L stainless steel lining corrosion-resistant alloy pipe as an example, the base steel pipe is X52 seamless steel pipe; due to the existence of the assembly gap between the inner and outer pipes, the starting point of the stress-strain curve of the base steel pipe moves to the right to point A, and the corrosion-resistant lining The alloy pipe is first deformed under the action of pressure. When the deformation reaches ε0, the outer wall of the lined corrosion-resistant...

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Abstract

The invention discloses a hydrostatic pressure expanding composite technology for a bimetal composite pipe. On the theoretical basis of the metal material elastoplastic theory, a residual contact stress calculation system between two layers of pipelines is finally obtained after hydraulic expanding force and expanding compounding technology are built for guiding to select the hydraulic expanding force and evaluate the compounding technology. The invention aims to provide the hydrostatic pressure expanding composite technology for the bimetal composite pipe, which is used for the production technology of the bimetal composite pipe with big caliber, long pipeline and the thick corrosion resistant alloy layer of which the maximum thickness can be 8.00mm.

Description

technical field [0001] The invention relates to a metal pipe compounding process, in particular to a bimetallic compound pipe hydrostatic pressure diameter expansion compounding process. Background technique [0002] The lined corrosion-resistant alloy composite steel pipe is a kind of bimetallic composite pipe. The research and development and application of bimetallic composite pipe in foreign countries are earlier. The early product manufacturing process is mainly based on metallurgical composite methods such as casting and rolling, and is widely used in Corrosion medium fluid pipeline, atomic energy, oil refining and chemical industry, seawater treatment and other fields. However, the high product price brought by this composite method discourages many users, especially for the application of low-pressure fluid pipelines and some low-alloy composite steel pipes. When the heat treatment delivery status of the two metal materials is different, the composite method of metal...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21D39/08
Inventor 陈伟沈达香
Owner JIANGSU XINPENG COMPOSITE MATERIALS
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